Case Study: Body temperature varies within individuals over time (it can be higher when one is ill with a fever, or during or after physical exertion). However, if we measure the body temperature of a single healthy person when at rest, these measurements vary little from day to day, and we can associate with each person an individual resting body temperature. There is, however, variation among individuals of resting body temperature. A sample of n = 130 individuals had an average resting body temperature of 98.25 degrees Fahrenheit and a standard deviation of 0.73 degrees Fahrenheit. Bret Hanlon and Bret Larget, Department of Statistics University of Wisconsin— Madison, October 11–13, 2011
Project: Write code to produce areas under a normal curve based on human body temperatures to answer questions about various percentages.
1. Type in the 3 lines of code given below into the R console (hit enter at the end of each line and don’t type the > sign).
2. Print out all the code you enter and everything the R produced 3. Type your answers to the questions.
4. Submit the output and your typed answers to the questions.
>pnorm(98.6, mean=98.25, sd=.73)
> pnorm(99.2, mean=98.25, sd=.73)-pnorm(98, mean = 98.25, sd=.73) > pnorm(98, mean=98.25, sd=.73)
#Area to the left of 98.6 #Area between 98 and 99.2 #Area to the left of 98
Questions:
Print out all the output that R produced and will produce in answering the following questions.
What percentage of people have body temperatures below 98.25?
What percentage of people have body temperatures above 98.25?
What percentage of people have body temperatures below 98.6?
What percentage of people have body temperatures above 98.6?
What percentage of people have body temperatures between 98 and 99.2?
What percentage of people have body temperatures above 98?
If there are 3,000 people in a community, how many will have temperatures below 98?
Write a line of code to answer the following question. You will have to keep changing the first number after the parenthesis to 3 decimal places until you get an answer as close to .900 as possible.

Answers

Answer 1

The desired percentage closest to 0.900 would be qnorm(0.900, mean=98.25, sd=0.73)

Here is the code output and the answers to the questions based on the provided code:

Code Output:

> pnorm(98.6, mean=98.25, sd=.73)

[1] 0.7068731

> pnorm(99.2, mean=98.25, sd=.73)-pnorm(98, mean = 98.25, sd=.73)

[1] 0.624655

> pnorm(98, mean=98.25, sd=.73)

[1] 0.3820886

Answers to the Questions:

What percentage of people have body temperatures below 98.25?

The code output is 0.3820886. Therefore, approximately 38.21% of people have body temperatures below 98.25.

What percentage of people have body temperatures above 98.25?

This can be calculated by subtracting the value from the total percentage (100%). So, approximately 61.79% of people have body temperatures above 98.25.

What percentage of people have body temperatures below 98.6?

The code output is 0.7068731. Therefore, approximately 70.69% of people have body temperatures below 98.6.

What percentage of people have body temperatures above 98.6?

This can be calculated by subtracting the value from the total percentage (100%). So, approximately 29.31% of people have body temperatures above 98.6.

What percentage of people have body temperatures between 98 and 99.2?

The code output is 0.624655. Therefore, approximately 62.47% of people have body temperatures between 98 and 99.2.

What percentage of people have body temperatures above 98?

The code output is 0.3820886. Therefore, approximately 38.21% of people have body temperatures above 98.

If there are 3,000 people in a community, how many will have temperatures below 98?

We can calculate this by multiplying the total population (3,000) by the percentage obtained for temperatures below 98 (0.3820886). Therefore, approximately 1,146 people in the community will have temperatures below 98.

Write a line of code to answer the following question. You will have to keep changing the first number after the parenthesis to 3 decimal places until you get an answer as close to 0.900 as possible.

The code to find the desired percentage closest to 0.900 would be:

qnorm(0.900, mean=98.25, sd=0.73)

This code uses the qnorm function to find the value corresponding to the given percentage (0.900) with the specified mean and standard deviation.

Note: The code output will provide the desired value that corresponds to a percentage of 0.900.

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Related Questions

A business wants to set up a three-sided fence to enclose a rectangular area of 2,000 square feet in the front of their store. If materials for the front of the fence that face the street cost them $20 per foot and the cost for the two other sides cost $15 dollars per foot, find the minimum cost for the project too the nearest cent. Solve the problem in 2 different ways: First use the method of LaGrange Multipliers, and then use the methods you learned from calculus 1 when working with a function of one variable. By doing this both ways you will connect your knowledge and get the most out of this word problem. Do not include units which are in dollars.

Answers

The values of L and W into the cost function C to find the minimum cost C = 20L + 15W + 15W

Using the Method of Lagrange Multipliers:

To find the minimum cost for the fence project, we can use the method of Lagrange multipliers to optimize the cost function subject to the constraint of the rectangular area being 2,000 square feet.

Let's denote the length of the rectangular area as L and the width as W. The cost function C is given by:

C = 20L + 15W + 15W

The constraint equation based on the area is:

L * W = 2000

We need to minimize the cost function C subject to this constraint. To do this, we introduce a Lagrange multiplier λ and form the Lagrangian function:

Lagrange Function = C - λ(Area Constraint)

= 20L + 15W + 15W - λ(L * W - 2000)

To find the minimum of the Lagrange function, we take partial derivatives with respect to L, W, and λ, and set them equal to zero:

∂L/∂L = 20 - λW = 0

∂L/∂W = 15 - λL = 0

∂L/∂λ = -L * W + 2000 = 0

Solving these equations simultaneously, we find the critical points. From the first equation, λ = 20/W. Substituting this into the second equation, we get:

15 - (20/W) * L = 0

L = 3W/4

Substituting L = 3W/4 into the third equation, we have:

-(3W/4) * W + 2000 = 0

-3W^2/4 + 2000 = 0

W^2 = (4/3) * 2000

W = √(8000/3)

Substituting this value of W back into L = 3W/4, we find:

L = (3/4) * √(8000/3)

To determine if this critical point is a minimum, we evaluate the second partial derivatives. However, since this involves extensive calculation, we will use an alternate approach to find the minimum cost.

Using Calculus 1 Concepts:

Let's express the cost function C in terms of a single variable, W. We can solve the constraint equation for L in terms of W:

L = 2000/W

Substituting this into the cost function C, we get:

C = 20L + 15W + 15W

= 20(2000/W) + 30W

Simplifying further, we have:

C = 40000/W + 30W

To find the minimum of this function, we take its derivative with respect to W and set it equal to zero:

dC/dW = -40000/W^2 + 30 = 0

Solving for W, we get:

40000/W^2 = 30

W^2 = 40000/30

W = √(40000/30)

Substituting this value of W back into the constraint equation L = 2000/W, we find:

L = 2000/√(40000/30)

Now, substitute the values of L and W into the cost function C to find the minimum cost:

C = 20L + 15W + 15W

Performing the calculations, we find the minimum cost for the project.

By applying the Method of Lagrange Multipliers and using calculus concepts from Calculus 1, we have determined the minimum cost for the fence project.

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Determine the number of times the graph of y = 5x² + 7x- 6 intersects the x-axis using two
different methods. The answers from each method should match.

Factoring

Quadratic Formula

Answers

Answer:

Method 1: Factoring

y = 5x² + 7x - 6

= 5x² + 10x - 3x - 6

= 5x(x + 2) - 3(x + 2)

= (5x - 3)(x + 2)

Method 2: Quadratic Formula

x = (-7 ± √(7² - 4 × 5 × -6)) / 2 × 5

= (-7 ± √(49 + 120)) / 10

= (-7 ± √169) / 10

= (-7 ± 13) / 10

x = 4/10 or x = -2

Simplify, we get:

x = 2/5 or x = -2

Therefore, the graph of y = 5x² + 7x - 6 intersects the x-axis at x = 2/5 and x = -2, so it intersects the x-axis twice.

What is the difference of the polynomials?
(8r6s3 - 9r5s4 + 3r4s5) - (2r4s5 - 5r3s6 - 4r5s4)
8r6s3 - 5r5s4 + r4s5 + 5r3s6

Answers

The difference of the polynomials (8r^6s^3 - 9r^5s^4 + 3r^4s^5) - (2r^4s^5 - 5r^3s^6 - 4r^5s^4) simplifies to 8r^6s^3 - 5r^5s^4 + r^4s^5 + 5r^3s^6.

To find the difference of the given polynomials, we subtract the second polynomial from the first polynomial term by term.

(8r^6s^3 - 9r^5s^4 + 3r^4s^5) - (2r^4s^5 - 5r^3s^6 - 4r^5s^4)

Removing the parentheses and combining like terms, we get:

8r^6s^3 - 5r^5s^4 + r^4s^5 + 5r^3s^6

Therefore, the difference of the polynomials is 8r^6s^3 - 5r^5s^4 + r^4s^5 + 5r^3s^6. This is the simplified form of the polynomial expression obtained by subtracting the second polynomial from the first polynomial.

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find the area under the curve y = 7 x 4 over the interval [ 0 , 3 ] give the exact value.

Answers

To find the area under the curve y = 7x^4 over the interval [0, 3], we need to integrate the function with respect to x using the definite integral formula:

∫[0, 3] 7x^4 dx

After integrating, we get:

(7/5)x^5]0^3

Plugging in the upper and lower limits of integration, we get:

(7/5)(3^5 - 0^5)

Simplifying further, we get:

(7/5)(243)

The exact value of the area under the curve y = 7x^4 over the interval [0, 3] is 1701/5.


We used the definite integral formula to find the area under the curve y = 7x^4 over the interval [0, 3]. The integral involves multiplying the function by dx and integrating with respect to x. After performing the integration and plugging in the limits of integration, we simplified the expression to get the exact value of the area.

The exact value of the area under the curve y = 7x^4 over the interval [0, 3] is 1701/5.

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Devon is looking at a chart that lists the levels of education needed for specific careers and their salary. He notices that work as a pharmacist and a physical therapist both require an advanced degree but have very different salaries. A pharmacist earns $111,570 per year, and a physical therapist earns $76,310 per year. What will be the difference in lifetime earnings over a 30-year career for these two careers?

Answers

Answer:

Step-by-step explanation:

111,570 x 30 = 3347100

76,310 x 30 = 2289300

3347100-2289300= 1057800

What is an equivalent expression for 4/3x=10/3

Answers

Answer:

4/3x = 10/3 is x = 5/2.

Step-by-step explanation:

To find an equivalent expression for the equation 4/3x = 10/3, we can multiply both sides of the equation by the reciprocal of the coefficient of x, which is 3/4.

By doing so, we get:

(3/4)(4/3)x = (3/4)(10/3)

Canceling out the common factors, we have:

1x = 10/4

Simplifying further:

x = 5/2

Therefore, an equivalent expression for the equation 4/3x = 10/3 is x = 5/2.

The cones have a radius of 2 inches and a height of 6 inches. It is a challenge to fill the narrow cones with their long fries. They want to use new cones that have the same volume as their existing cones but a larger radius of 4 inches.

Answers

Answer: 3 inches tall

Step-by-step explanation:

calls arrive at a switchboard with a mean of one every 21 seconds. what is the exponential probability that it will take more than 31 seconds for the next call to arrive?

Answers

The exponential probability that it will take more than 31 seconds for the next call to arrive is approximately 0.4210.

In an exponential distribution, the mean (μ) is equal to the reciprocal of the rate parameter (λ). Given that the mean time between calls is 21 seconds, we can determine the rate parameter λ:

λ = 1 / μ = 1 / 21

To find the exponential probability that it will take more than 31 seconds for the next call to arrive, we need to calculate the cumulative distribution function (CDF) for the exponential distribution up to 31 seconds and subtract it from 1.

P(X > 31) = 1 - F(31)

Where F(x) represents the CDF of the exponential distribution.

The CDF of the exponential distribution is given by:

F(x) = 1 - e^(-λx)

Substituting the value of λ:

F(x) = 1 - e^(-x/21)

Now, we can calculate the exponential probability:

P(X > 31) = 1 - F(31)

= 1 - (1 - e^(-31/21))

≈ e^(-31/21)

Using a calculator or software, we find that e^(-31/21) ≈ 0.4210.

Therefore, the exponential probability that it will take more than 31 seconds for the next call to arrive is approximately 0.4210.

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A pool must have a fence in order to be in compliance with state law. Each side of the pool area was 14. 5 by 16. 5 feet. Sherri wanted to put a fence around just the area of the pool. How much fencing would she need to buy?

Answers

Fencing she needs to buy to put a fence around just the area of the pool is 62 feet.

Regarding the amount of fencing Sherri needs to buy to surround the pool area, we need to find the perimeter of the pool.

The perimeter of a rectangle is found by adding the lengths of all its sides. In this case, the pool area has four sides, each measuring 14.5 feet or 16.5 feet.

Perimeter = 2 × (Length + Width)

For the pool area, the length is 14.5 feet and the width is 16.5 feet:

Perimeter = 2 × (14.5 + 16.5)

Perimeter = 2 × 31

Perimeter = 62 feet

Therefore, Sherri would need to buy 62 feet of fencing to surround just the area of the pool.

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i cant find the answer

Answers

The function D(t) = 1900(0.729)ᵗ is the resulting expression in the form abᵗ

Solving exponential equations

From the question, we have the following parameters that can be used in our computation:

D(t) = 1900(0.9)³ᵗ

Given the exponential equation below showing the quantity of element decaying as:

D(t) = 1900(0.9)³ᵗ

We need to rewrite the expression in the form D(t) = abᵗ

The given expression can be simplified as:

D(t) = 1900(0.9)³ᵗ

So, we have

D(t) = 1900((0.9)³)ᵗ

This gives

D(t) = 1900 * (0.729)ᵗ

Evaluate the product

D(t) = 1900(0.729)ᵗ

Hence the resulting expression in the form abᵗ is D(t) = 1900(0.729)ᵗ

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find the volume of the solid generated by revolving the region about the y-axis. the region enclosed by 5sin(5y)

Answers

The volume using V = 2π∫[0, 2π/5] 5sin(5y) * dy. By evaluating this integral, we will obtain the volume of the solid generated by revolving the region about the y-axis.

The volume of the solid generated by revolving the region enclosed by the curve 5sin(5y) about the y-axis can be found using the method of cylindrical shells.

The volume V of the solid is given by V = 2π∫[a,b] x(y) * h(y) dy, where x(y) represents the distance between the curve and the y-axis, and h(y) represents the height of the cylindrical shell.

In this case, the curve is defined as 5sin(5y), where y ranges from y = a to y = b. To find the distance between the curve and the y-axis, we can consider the function x(y) = 5sin(5y). The height of the cylindrical shell, h(y), can be taken as a small change in y, which is dy.

Substituting these values into the formula, we have V = 2π∫[a,b] 5sin(5y) * dy. Now, we need to determine the limits of integration, a and b, which define the region enclosed by the curve.

To find these limits, we can set 5sin(5y) equal to zero and solve for y. The solutions will give us the y-values where the curve intersects the y-axis. By analyzing the sine function, we can determine that these intersections occur at y = 0, π/10, 2π/10, and so on.

Considering the given curve is periodic with a period of 2π/5, we can choose the limits of integration as a = 0 and b = 2π/5 to cover one complete period of the curve.

Now, we can calculate the volume using V = 2π∫[0, 2π/5] 5sin(5y) * dy. By evaluating this integral, we will obtain the volume of the solid generated by revolving the region about the y-axis.

By following these steps, we can find the precise volume of the solid in question using the cylindrical shells method.

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Distribute and combine like terms
8(-6+10)-14x

Answers

Distributing and combining like terms 8(-6+10)-14x we get 32 - 14x .

The equation is

8 ( - 6 + 10 ) - 14 x

Distributing the number in Distributive property multiplying the sum of two or more addends by a number produces the same result as when each addend is multiplied individually by the number and the products are added together.

Applying distributive property on the equation we get

8 × ( - 6 ) + 8 × ( 10 ) - 14x

On multiplying we get,

-48 + 80 - 14x

Combining the like terms

32 - 14x

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Find closed-form expressions for el for each of the following matrices. * 0 (a) A = (b) A = Lito (c) A = (d) A = -6:] (e) A = (1) A A-[- [:-] 1-6 :] - [16 -:] (g) A = (h) A

Answers

The closed-form expressions for matrix [tex]e^A[/tex] are (a) [tex]e^A[/tex]= [4 0; 2 e], (b) [tex]e^A[/tex] = [21.5 40; 24 47]

To find the closed-form expressions for [tex]e^A[/tex], where A is a given matrix, we can use the matrix exponential formula

[tex]e^A[/tex] = I + A + (A²)/2! + (A³)/3! + ...

Let's calculate the expressions for the given matrices

(a) A = [3 0; 1 1]

To find [tex]e^A[/tex], we need to calculate the powers of A

A² = [3 0; 1 1] * [3 0; 1 1] = [9 0; 4 1]

Now we can substitute the values into the matrix exponential formula

[tex]e^A[/tex] = I + A + (A²)/2! + ...

[tex]e^A[/tex] = [1 0; 0 1] + [3 0; 1 1] + ([9 0; 4 1])/(2!) + ...

Simplifying the expression gives

[tex]e^A[/tex] = [4 0; 2 e]

(b) A = [1 8; 6 7]

Following the same procedure, let's calculate A²

A² = [1 8; 6 7] * [1 8; 6 7] = [37 64; 48 86]

Substituting into the matrix exponential formula

[tex]e^A[/tex] = I + A + (A²)/2! + ...

[tex]e^A[/tex]= [1 0; 0 1] + [1 8; 6 7] + ([37 64; 48 86])/(2!) + ...

Simplifying the expression gives

[tex]e^A[/tex] = [3 + 37/2 8 + 64/2; 6 + 48/2 7 + 86/2] = [21.5 40; 24 47]

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--The given question is incomplete, the complete question is given below "Find closed-form expressions for el for each of the following matrices. * 0 (a) A = [3  0; 1  1] (b) A = [1 8; 6 7]"--

the volume of the shape is 220.5cm the length is 7cm the height is 7cm what is the width?

Answers

Answer:

Volume = length x width x height

Substituting the given values, we get:

220.5 cm^3 = 7 cm x width x 7 cm

Simplifying and solving for the width, we get:

220.5 cm^3 = 49 cm^2 x width

width = 220.5 cm^3 / 49 cm^2

width = 4.5 cm (rounded to one decimal place)

Therefore, the width of the shape is 4.5 cm.

Find the area of the shape of 2


Either enter an exact answer in terms of pi or use 3. 14 for pi and enter as decimal

Answers

The area of the shape is 12.56 square units.To find the area of the shape, we need more specific information about the shape itself. The given question only mentions "the shape of 2" without any further details or description

Without a clear understanding of the shape's dimensions or characteristics, it is challenging to provide an accurate answer. However, if we assume that the shape is a circle, we can proceed to calculate its area. A circle is a common shape that is defined by its radius or diameter. The formula for calculating the area of a circle is: Area = π * r^2 where π (pi) is a mathematical constant approximately equal to 3.14, and r is the radius of the circle. Let's consider a circle with a radius of 2 units: Area = π * (2^2)

[tex]= π * 4\\≈ 3.14 * 4\\≈ 12.56[/tex]

Therefore, if the shape is a circle with a radius of 2 units, the area would be approximately 12.56 square units. It's important to note that without further information or a clear definition of the shape, our assumption of a circle might not be accurate. Different shapes would require different formulas or methods to calculate their areas

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O Graph the following trigonometric function for one period: y=2-cos(-x-^)

Answers

Given function: y = 2 - cos(-x - π). We know that the cosine function is an even function, which means that cos(-x) = cos(x).

So, cos(-x - π) = cos(x + π) = -cos(x)We can write the given function as:

y = 2 - (-cos(x))= 2 + cos(x)

we need to find the x-values of the function that satisfy:

x = 0, π/2, π, 3π/2, 2πWe can use these x-values to graph the function over one period using the amplitude, midline, and period.

We can also find the corresponding y-values for each x-value.

The table below shows these values:

x0π/2π3π/22πy32-12-32We can now plot these points and sketch the graph of the function as shown below:

Graph of the function y = 2 - cos(-x - π)

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The sector of a circle has an area of 104π/9 square inches and a central angle with measure 65° What is the radius of the circle, in inches?

A- 104 in
B- 64 in
C- 5.7 in
D- 8 in

Answers

[tex]\textit{area of a sector of a circle}\\\\ A=\cfrac{\theta \pi r^2}{360} ~~ \begin{cases} r=radius\\ \theta =\stackrel{degrees}{angle}\\[-0.5em] \hrulefill\\ \theta =65\\ A=\frac{104\pi }{9} \end{cases}\implies \cfrac{104\pi }{9}=\cfrac{(65)\pi r^2}{360}\implies \cfrac{104\pi }{9}=\cfrac{13\pi r^2}{72} \\\\\\ \cfrac{72}{13\pi}\cdot \cfrac{104\pi }{9}=r^2\implies 64=r^2\implies \sqrt{64}=r\implies \boxed{8=r}[/tex]

Select equivalent expressions AND solve. 1-2z+2=2² +6 A) [x = -√2+1, z = √2+1] c)[-(-).(-)) E) I B) [x = D) (z=1] F) none of these i SELECT ALL APPLICABLE CHOICE √33-5,2 HUL √2015
Solve for

Answers

This option is correct as none of the options A, B, C, D, E hold true for equivalent expressions  z=9. Hence, the answer is option (F). We don't need to check option F as it simply means that none of the given options hold true for z=9.

Given equation is 1-2z+2=2² +6We need to simplify this equation to solve the value of z.

1-2z+2=4+61

-2z+2=

10-2z3-2z=1

03=2zZ

=3/2 .

Hence, the correct option is (D). (z=1).

 The given equation is 1-2z+2=2² +6.

To solve the given equation, we need to simplify it first.1-2z+2=2² +6   ⇒ 1-2z+2=4+6  

⇒ 1-2z+2=10  or  

3-2z=10  

⇒ -2z=7  

⇒ 2z=-7 .

Now, we need to solve for the value of z.  ⇒ z=-7/2.

The given options are:(A) [x = -√2+1, z = √2+1](B)

[x = √2+1, z = 2√2-1](C)

[-(-).(-)](D) (z=1)(E) I(F) none of these Out of these options, only option (D) (z=1) is correct.

Hence, the correct answer is option (D).

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which of the following will increase the power of a statistical test? a. none of the other options will increase power b. change the variability of the scores from 20 to 100 c. change the sample size from n

Answers

Change the sample size from n  will increase the power of a statistical test. The correct answer is C.

Increasing the sample size is one of the most effective ways to increase the power of a statistical test. With a larger sample size, there is a greater chance of detecting a true effect or rejecting a false null hypothesis.

This is because a larger sample provides more information and reduces sampling variability, leading to more precise estimates and increased statistical power.

The other options listed, such as changing the variability of the scores or changing the significance level, may have an impact on the statistical test but may not directly increase the power. Changing the variability of the scores may affect the precision of the estimates, but it may or may not increase the power of the test.

Similarly, changing the significance level affects the trade-off between Type I and Type II errors, but it does not directly increase the power. The correct answer is C.

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suppose an investigator wishes to estimate the sample size necessary to detect a 10 mg/dl difference in cholesterol level in a diet intervention group compared to a control group. the standard deviation from past data is estimated to be 50 mg/dl. if power is set at 80% and alpha is set at 0.05, how many patients are required per group?

Answers

Rounding up to the nearest whole number, we need at least 78 patients per group to detect a 10 mg/dl difference in cholesterol level with a power of 80% and an alpha level of 0.05.

To estimate the sample size necessary to detect a 10 mg/dl difference in cholesterol level between a diet intervention group and a control group with a standard deviation of 50 mg/dl, a power of 80%, and an alpha level of 0.05, we can use a formula:
n = [(Z_alpha/2 + Z_beta)^2 * (σ^2)] / (d^2)
where n is the sample size per group, Z_alpha/2 is the critical value of the standard normal distribution corresponding to an alpha level of 0.05/2 = 0.025 (which is 1.96), Z_beta is the critical value of the standard normal distribution corresponding to a power of 80% (which is 0.84), σ is the standard deviation (which is 50 mg/dl), and d is the difference in means that we want to detect (which is 10 mg/dl).
Substituting these values into the formula, we get:
n = [(1.96 + 0.84)^2 * (50)^2] / (10)^2
n = 77.4
Rounding up to the nearest whole number, we need at least 78 patients per group to detect a 10 mg/dl difference in cholesterol level with a power of 80% and an alpha level of 0.05.

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Help Save There has been a lot of discussion regarding the relationship between Scholastic Aptitude Test (SAT) scores and test- takers' family income (The New York Times, August 27. 2009). It is generally believed that the wealthier a student's family, the higher the SAT score. Another commonly used predictor for SAT scores is the student's grade point average (GPA) Consider the following portion of data collected on 24 students SA 1,651 1,58134,08 47,888 2.79 2.97 1,940 113,000 3.96 a. Estimate three models: (Round your answers to 4 decimal places.) [If you are using R to obtain the output, then first enter the following commend at the prompt: options(scipen-10). This will ensure that the output is not in scientific notation.] (ii) SAT=Ag + 61GPA + E, and (ii) SAT 8 61Income 82GPA Model 1: . SAT = Model 21SAT Income GPA + Hotner Commoly used predictor for SAT scores is the student's g collected on 24 students. GPA 2.79 2.97 ncome 1,651 1,58134,000 47,000 1,940 113,0003.96 Click here for the Excel Data File a. Estimate three models: (Round your answers to 4 decimal places.) following command at the prompt: options(scipen-10). This will ensu () SAT-80 + 01|ncome + ε. (ii) SAT=6e +81GPA + ε, and (ii) SAT 60 + 81Income + 82GPA E. Model 1SAT "L ] GPA Model 2: Model 3: SAT. . SAT GPA . ncome+ o search c. Use the preferred model to predict SAT given the mean value of the explanatory variable(s). (Round coefficie mean values to at least 4 decimal places and final answer to 2 decimal places.) SAT

Answers

The first model, SAT = β₀ + β₁Income + β₂GPA + ε, included both income and GPA as predictors.

The second model, SAT = β₀ + β₁ GPA + ε, only included GPA as a predictor.

The third model, SAT = β₀ + β₁ Income + ε, solely used income as a predictor.

To examine the relationship between SAT scores and explanatory variables, three models were estimated based on the provided data. The first model, SAT = β0 + β1Income + β2GPA + ε, included both income and GPA as predictors. The second model, SAT = β0 + β1GPA + ε, only considered GPA as a predictor, while the third model, SAT = β0 + β1Income + ε, solely used income as a predictor.

The coefficients (β) of the models were estimated using statistical methods. These coefficients represent the relationship between the predictors and the SAT scores. By plugging in the mean values of the explanatory variables into the preferred model, the SAT score can be predicted. The preferred model is the one that is most appropriate for the given data and research question.

To obtain the predicted SAT score, the mean value of the explanatory variable(s) is substituted into the preferred model. The coefficients estimate the impact of the variables on the SAT score. The resulting prediction provides an estimate of the SAT score based on the mean values of the predictors.

It's important to note that the actual values of the coefficients and predictions cannot be provided without the specific values of the coefficients and mean values of the explanatory variables in the given data.

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If y varies jointly as x and z, and y=−16 when x=4 and z=2, find y when x is −1 and z is 7.

Answers

Answer:

y= -16

Step-by-step explanation:

lmk if im wrong but the image is my explanation

Let R be the relation of congruence mod 4 on Z: aRb if a b 4k for some k E Z (a) What integers are in the equivalence class of 18? (b) What integers are in the equivalence class of 31? (c) How many distinct equivalence classes are there? What are they?v

Answers

The relation of congruence mod 4 on Z is defined as aRb if a = b + 4k for some integer k.

This means that all integers in the same equivalence class are congruent to each other mod 4.

For (a), the equivalence class of 18 is {18, 22, 26, 30, 34, 38, 42, ...}. This is because 18, 22, 26, 30, 34, 38, 42, etc. are all congruent to 18 mod 4.

For (b), the equivalence class of 31 is {31, 35, 39, 43, 47, 51, ...}. This is because 31, 35, 39, 43, 47, 51, etc. are all congruent to 31 mod 4.

For (c), there are four distinct equivalence classes: {0, 4, 8, 12, 16, 20, 24, ...}, {1, 5, 9, 13, 17, 21, 25, ...}, {2, 6, 10, 14, 18, 22, 26, ...}, and {3, 7, 11, 15, 19, 23, 27, ...}. This is because each of these classes contains all of the integers that are congruent to that class mod 4.

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Suppose 195 randomly selected people are surveyed to determine if they own a tablet. Of the 195 surveyed, 75 reported owning a tablet. Using a 94% confidence level, compute a confidence interval estimate for the true proportion of people who own tablets. (Round the answers to 4 decimal places)

Answers

The confidence interval estimate for the true proportion of people who own tablets, based on a survey of 195 randomly selected people where 75 reported owning a tablet, with a 94% confidence level.

To calculate the confidence interval for the true proportion, we can use the formula:

Confidence Interval = Sample Proportion ± Margin of Error

First, we need to calculate the sample proportion, which is the number of individuals who own a tablet divided by the total sample size:

Sample Proportion = Number of tablet owners / Sample size = 75 / 195 ≈ 0.3846

Next, we calculate the margin of error, which takes into account the sample size and the desired confidence level. The margin of error is given by:

To compute the confidence interval estimate, we need to calculate the margin of error and then construct the interval around the sample proportion.

   Calculate the sample proportion (p-hat):

   p-hat = number of tablet owners / total sample size

   = 75 / 195

   ≈ 0.3846

   Calculate the standard error (SE):

   SE = √[(p-hat * (1 - p-hat)) / n]

   = √[(0.3846 * (1 - 0.3846)) / 195]

   ≈ 0.0401

   Determine the critical value (Z) for a 94% confidence level:

   Since the confidence level is 94%, the significance level (α) is (1 - confidence level) / 2 = 0.06 / 2 = 0.03.

   Using a standard normal distribution table or a calculator, we can find the critical value associated with a 0.03 area in the upper tail, which is approximately 1.8808.

   Calculate the margin of error (ME):

   ME = Z * SE

   = 1.8808 * 0.0401

   ≈ 0.0754

   Construct the confidence interval:

   Lower bound = p-hat - ME

   = 0.3846 - 0.0754

   ≈ 0.3092

   Upper bound = p-hat + ME

   = 0.3846 + 0.0754

   ≈ 0.4592

   Round the confidence interval bounds to four decimal places:

   Lower bound ≈ 0.3092

   Upper bound ≈ 0.4592

Therefore, the confidence interval estimate for the true proportion of people who own tablets, based on the given data and a 94% confidence level, is approximately 0.3092 to 0.4592.

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HELP ASAP! 30 points!
Of the 120 participants participating in a case study of an experimental treatment, 55 of them experienced no significant side effects from the treatment. What is the probability of a person receiving the treatment to experience significant side effects?

Explain your reasoning.
PLEASE SHOW ALL WORK thanks.

Answers

Answer:

54.17%

Step-by-step explanation:

The probability of a person receiving the treatment experiencing significant side effects is calculated by dividing the number of people who experienced significant side effects by the total number of participants. Since 55 out of 120 participants experienced no significant side effects, then 120 - 55 = 65 participants experienced significant side effects. Therefore, the probability of a person receiving the treatment experiencing significant side effects is 65/120 = 0.54 or 54%.

At the beginning of the month, there were 80 ounces of peanut butter in the pantry. Since then, the family ate 0. 3 of the peanut butter. How many ounces of peanut butter is in the pantry now? A. 0. 7 x 80 B. 0. 3 x 80 C. 80 - 0. 3 D. (1 + 0. 3) x 80

Answers

At the beginning of the month, there were 80 ounces of peanut butter in the pantry. Since then, the family ate 0.3 of the peanut butter. Now, the peanut butter left in the pantry is 56 ounces (Option C).

To determine the amount of peanut butter in the pantry now, we need to calculate 0.3 of 80 ounces:

0.3 x 80 = 24

Therefore, the family has eaten 24 ounces of peanut butter. To determine how many ounces of peanut butter are in the pantry now, we need to subtract the amount eaten from the original amount: 80 - 24 = 56

Therefore, there are 56 ounces of peanut butter in the pantry now. Option C is correct.80 - 0.3 = 56.0

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Consider the function p(x)= x-4/(-4x^2+4) . what are the critical points?

Answers

The critical points for the rational function defined as [tex]p(x) = \frac{ x - 4}{-4x² + 4}[/tex] are equal to the [tex]x =\ frac{ -4 ± \sqrt {13}}{ 3} [/tex].

A critical point of a function y = f(x) is a point say (c, f(c)) on graph of f(x) where either the derivative is 0 (or) the derivative is not defined. Steps to determine the critical point(s) of a function y = f(x):

calculate the derivative f '(x).Set f '(x) = 0 and solve it to determine all the values of x (if any) satisfying it.determine all the values of x (if any) where f '(x) is NOT defined. All the values of x (only which are in the domain of f(x)) from above steps the x-coordinates of the critical points. Then determine the corresponding y-coordinates by substitute each of them.Writing all such pairs (x, y) represents the critical points.

[tex]p(x) = \frac{ x - 4}{-4x² + 4}[/tex]

We have to determine the critical points for function. Using the above steps, p'(x) = 0

=> [tex]p'(x) = \frac{(-4x² + 4) -( x - 4)(-8x)}{(-4x² + 4)²}[/tex]

[tex] = \frac{(-4x² + 4) - 8x² - 32x)}{(-4x² + 4)²}[/tex]

[tex] = \frac{(-12x² - 32x + 4)}{(-4x² + 4)²}[/tex]

so, [tex]\frac{(-12x² - 32x + 4)}{(-4x² + 4)²} = 0[/tex]

=> - 12x² - 32x + 4 = 0

=> 3x² + 8x + 1 = 0

solve the Quadratic equation by quadratic formula,

=> [tex]x = \frac{ -8 ± \sqrt { 64 - 12}}{ 6} [/tex]

[tex]x = \frac{ -4 ± \sqrt {13}}{ 3} [/tex].

Hence, required value are [tex]x = \frac{ -4 ± \sqrt {13}}{ 3} [/tex].

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PLEASE HURRY ⏰ select the 2 missing "X Values" and "Y Values" from the table to complete it Select ALL that apply h(x)= -(1/4)^x

Answers

The values for "Y" correspond to the chosen "X" values are [tex]-0.0625,-0.25,-1,-0.25,-0.0625[/tex]

What are functions?

A function, also known as the domain and the range, is a fundamental idea in mathematics that represents the relationship between two sets of elements. Each element in the domain is paired with a different element in the range.

A function is, more precisely, a rule or a correspondence that links every input value from the domain to precisely one output value from the range. The variable x normally represents the input values, and the variable y or f(x) typically represents the corresponding output values.

A function can be envisioned as a device that accepts an input and outputs a particular result in accordance with the rule or operation specified by the function. Only the input value influences the output, and each

Calculating the corresponding values of "X" and "Y" for each row is necessary to finish the table for the function [tex]h(x) = -(1/4)x[/tex]. I am not able to choose the missing values because the table is not provided. But I can explain to you how to figure out the function's values.

A function that depicts an exponential function is [tex]h(x) = -(1/4)x[/tex]. You can use the provided function to find the values by selecting a range of "X" values and determining the corresponding "Y" values.

Let's pick a range of "X" values from [tex]-2 to 2[/tex], for illustration:

when [tex]x = -2:[/tex]

[tex]h(-2) = -(1/4)^(-2) = -(1/4)^2 = -(1/16) = -0.0625[/tex]

when [tex]x = -1:[/tex]

[tex]h(-1) = -(1/4)^{-1} = -(1/4)^1 = -1/4 = -0.25[/tex]

when [tex]x = 0:[/tex]

[tex]h(0) = -(1/4)^0 = -1^0 = -1[/tex]

when [tex]x = 1:[/tex]

[tex]h(1) = -(1/4)^1 = -1/4 = -0.25[/tex]

when [tex]x=2:[/tex]

[tex]h(2) = -(1/4)^2 = -1/16 = -0.0625[/tex]

These are the values for "Y" corresponding to the chosen "X" values. Depending on the table, you can select the appropriate values to complete it.

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Which table could be a partial set of values for a linear function? Responses x y 0 3 1 5 2 7 3 9 x y 0 3 1 5 2 7 3 9 , , , x y 0 0 1 2 2 8 3 18 x y 0 0 1 2 2 8 3 18 , , , x y 0 9 1 8 2 5 3 0 x y 0 9 1 8 2 5 3 0 , , , x y 0 1 1 2 2 5 3 10 x y 0 1 1 2 2 5 3 10 , , ,

Answers

The table that could be a partial set of values for a linear function is: Table B

How to find the table of linear equation?

A Linear function is the one whose graph represents a line.

Also, the value of dependent and independent variable in linear function change at a constant rate.

Now, in table A,C and D.

A.          

x   y

0   0        

1   1

2   4

3   9

C.

x   y

0   0

1   1

2   8

3   27

D.

x      y

0    0.0

1    0.5

2    2.0

3    4.5

In the tables A,C,D we see that the values of y do not change here at a constant rate.

Now, in table B.

x      y

0    0.0

1    0.5

2    1.0

3    1.5

Here the values of y changes at a constant rate.

that is 0.5 - 0.0=0.5 and 1.0 - 0.5 = 0.5

So, these are the values of a linear function.

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The complete question is:

Which table could be a partial set of values for a linear function?

A. x y

0 0

1 1

2 8

3 27

B. x y

0 0.0

1 0.5

2 1.0

3 1.5

C. x y

0 0

1 1

2 4

3 9

D. x y

0 0.0

1 0.5

2 2.0

3 4.5

Consider the following function: f(x) = 373 - 10 (a) What is the inverse function f-'()? (b) What is the domain of f-'()? (Type infinity for .) Click for List Click for List

Answers

(a) The inverse function f⁻¹(x) is  [tex]f^{-1}(x) = \sqrt[3]{\frac{x +10}{3} }[/tex]

(b) The domain of f⁻¹(x) is [-∞, ∞].

What is an inverse function?

In Mathematics, an inverse function simply refers to a type of function that is obtained by reversing the mathematical operation in a given function (f(x)).

In this exercise, you are required to determine the inverse of the function f(x). This ultimately implies that, we would have to interchange both the independent value (x-value) and dependent value (y-value) as follows;

f(x) = y = 3x³ - 10

x = 3y³ - 10

3y³ = x + 10

y³ = (x + 10)/3

By taking the cube root of both sides of the function, we have:

[tex]f^{-1}(x) = \sqrt[3]{\frac{x +10}{3} }[/tex]

Part b.

Based on the graph of the inverse function shown in the image attached below, we can logically deduce the following domain:

Domain = [-∞, ∞] or all real numbers.

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Missing information:

The question is incomplete and the complete question is shown in the attached picture.

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