The statistical question is what are the heights of the students in my history class?
What is a statistical question?A statistical question is a question that can be answered by collecting data that vary. For example, the heights of students in your class would be different. Some students would be really tall while others would be short.
The number of letters in your name is constant. For example, if your name is Amy. There would be always be three letters in your name. Thus, it is not a statistical question.
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At UTAS Shinas, ten people had a diabetes test every day The table shows the data based on age and number of diabetes tests. You are a statistical analyst at the college, and the medical assistant has sent the above report to you because you need to find the relation between two variables based on y = a + bx. How will you proceed to submit this report?
For a statistical analysis, the report should include an introduction, methodology, results, discussion, and conclusion. It should be written in a clear and concise manner, and include any visual aids such as graphs or tables that help to illustrate the findings.
To find the relation between the two variables, age and number of diabetes tests, based on the linear equation y = a + bx, we need to perform linear regression analysis. follow the steps:
Collect the data in the table.
Organize the data into a spreadsheet, with the age and the number of diabetes tests as the two columns.
Calculate the mean of the age and the number of diabetes tests.
Calculate the covariance between age and the number of diabetes tests.
Calculate the variance of the age.
Calculate the regression coefficient (b) using the formula b = covariance / variance.
Calculate the intercept (a) using the formula a = mean(y) - b * mean(x), where x is the age and y is the number of diabetes tests.
Plot the data of the age and the number of diabetes tests.
Draw the regression line on the scatter plot using the equation y = a + bx.
Interpret the results by writing a report that explains the relationship between age and the number of diabetes tests, based on the regression analysis.
Include the information such as correlation coefficient, coefficient of determination (R-squared), and p-value.
Conclude the report with recommendations.
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A plant manager is considering buying additional stamping machines to accommodate increasing demand. The alternatives are to buy 1 machine, 2 machines, or 3 machines. The profits realized under each alternative are a function of whether their bid for a recent defense contract is accepted or not. The payoff table below illustrates the profits realized (in $000's) based on the different scenarios faced by the manager.Alternative Bid Accepted Bid RejectedBuy 1 machine $10 $5Buy 2 machines $30 $4Buy 3 machines $40 $24) Refer to the information above.a. Which alternative should be chosen based on the maximax criterion?b. Which alternative should be chosen based on the maximin criterion?c. Which alternative should be chosen based on the Lapalce criterion?d. Which alternative should be chosen based on criterion of realism with alpha = 0.8?e. Which alternative should be chosen based on the minimax regret criterion?
The alternative of buying 3 machines should be chosen based on the maximin criterion.
a. The maximax criterion suggests choosing the alternative with the maximum possible payoff. In this case, the maximum payoffs for each alternative are $10,000, $30,000, and $40,000 for buying 1, 2, and 3 machines respectively. Therefore, the alternative of buying 3 machines should be chosen based on the maximax criterion.
b. The maximin criterion suggests choosing the alternative with the maximum possible minimum payoff. In this case, the minimum payoffs for each alternative are $5,000, $4,000, and $24,000 for buying 1, 2, and 3 machines respectively. Therefore, the alternative of buying 3 machines should be chosen based on the maximin criterion.
c. The Laplace criterion suggests choosing the alternative with the highest expected payoff, calculated as the average of the payoffs under each scenario. The expected payoffs for each alternative are $7,500, $17,000, and $32,000 for buying 1, 2, and 3 machines respectively. Therefore, the alternative of buying 3 machines should be chosen based on the Laplace criterion.
d. The criterion of realism with alpha = 0.8 suggests choosing the alternative with the highest weighted payoff, where the weight is based on the manager's degree of optimism (alpha). The weighted payoffs for each alternative are $8,500, $17,800, and $36,800 for buying 1, 2, and 3 machines respectively. Therefore, the alternative of buying 3 machines should be chosen based on the criterion of realism with alpha = 0.8.
e. The minimax regret criterion suggests choosing the alternative with the minimum possible maximum regret, which is the difference between the maximum possible payoff and the payoff under each scenario. The maximum regrets for each alternative are $20,000, $26,000, and $16,000 for buying 1, 2, and 3 machines respectively. Therefore, the alternative of buying 3 machines should be chosen based on the minimax regret criterion.
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Help please and thank youuuuuu
The value of x in the rectangular prism is 9 inches.
How to find the height of the rectangular prism?The height of the rectangular prism can be found as follows:
The volume of the rectangular prism is 153 inches cube.
Therefore,
volume of the rectangular prism = lwh
where
l = lengthh = heightw = widthTherefore,
volume of the rectangular prism = 8.5 × 2 × x
153 = 17x
divide both sides by 17
x = 153 / 17
x = 9 inches
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Help me pls. paying a lot of points
Answer:
33.3333%
Step-by-step explanation:
Answer:3/6 or 1/2
Step-by-step explanation:
(8 marks) Find the root of the equation, f(x) = xe^x – 1 using fixed point iteration and Aitken Acceleration, accurate up to machine epsilon of 1 x 10^-5. Use the iteration formula g(x) = e^-x, and start the iteration using xo = 0.
To find the root of the equation f(x) = xe^x – 1 using fixed point iteration and Aitken Acceleration, accurate up to machine epsilon of 1 x 10^-5, we will use the iteration formula g(x) = e^-x and start the iteration using xo = 0.
1. Fixed Point Iteration:
To apply fixed point iteration, we will use the iteration formula g(x) = e^-x, which gives us the next value for x. The algorithm for fixed point iteration is:
- Start with an initial guess, xo = 0
- Iterate using xn+1 = g(xn) until |xn+1 - xn| < ε, where ε = 1 x 10^-5
Using this algorithm, we get the following iterations:
x0 = 0
x1 = g(x0) = e^0 = 1
x2 = g(x1) = e^-1 ≈ 0.36788
x3 = g(x2) = e^-0.36788 ≈ 0.69315
x4 = g(x3) = e^-0.69315 ≈ 0.50000
x5 = g(x4) = e^-0.50000 ≈ 0.60653
x6 = g(x5) = e^-0.60653 ≈ 0.54520
x7 = g(x6) = e^-0.54520 ≈ 0.57961
x8 = g(x7) = e^-0.57961 ≈ 0.56012
x9 = g(x8) = e^-0.56012 ≈ 0.57114
x10 = g(x9) = e^-0.57114 ≈ 0.56488
After 10 iterations, we get an approximate solution of x ≈ 0.56488, which is accurate up to machine epsilon of 1 x 10^-5.
2. Aitken Acceleration:
Aitken Acceleration is a technique to speed up the convergence of a fixed point iteration by estimating the limit of the sequence using the last three terms. The algorithm for Aitken Acceleration is:
- Start with an initial guess, xo = 0
- Iterate using xn+1 = g(xn) until |xn+1 - xn| < ε, where ε = 1 x 10^-5
- Apply Aitken Acceleration to the sequence {xn} using the formula:
y_n = x_n - (x_n - x_{n-1})^2 / (x_n - 2x_{n-1} + x_{n-2})
- Iterate using y_n until |y_n+1 - y_n| < ε
Using this algorithm, we get the following iterations:
x0 = 0
x1 = g(x0) = e^0 = 1
x2 = g(x1) = e^-1 ≈ 0.36788
x3 = g(x2) = e^-0.36788 ≈ 0.69315
Then, we apply Aitken Acceleration to the sequence {xn}:
y0 = x0 = 0
y1 = x1 = 1
y2 = x2 - (x2 - x1)^2 / (x2 - 2x1 + x0) ≈ 0.56714
y3 = x3 - (x3 - x2)^2 / (x3 - 2x2 + x1) ≈ 0.56408
After 3 iterations, we get an approximate solution of x ≈ 0.56408, which is accurate up to machine epsilon of 1 x 10^-5. Aitken Acceleration gives us a faster convergence compared to fixed point iteration.
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Suppose a normal distribution has a mean of 79 and a standard deviation of
7. What is P(x286)?
OA. 0.975
B. 0.84
O C. 0.025
D. 0.16
The value of P(x286) is 0.16, the correct option is D.
We are given that;
Mean=79
Standard deviation=7
Now,
To calculate the probability for a normal distribution, you need to convert the raw score x into a standard score z using the formula z = (x - mean) / standard deviation12. Then you need to find the area under the normal curve corresponding to the z-score using a table or a calculator13.
The z-score for x = 86 is:
z = (86 - 79) / 7 = 1
Using a table or a calculator, we can find that the area under the normal curve to the left of z = 1 is about 0.8413. This means that P(x < 86) ≈ 0.8413.
To find P(x > 86), we can use the fact that the total area under the normal curve is 1. So, P(x > 86) = 1 - P(x < 86) ≈ 1 - 0.8413 = 0.1587.
Therefore, by the given mean the answer will be 0.16.
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Trisha owns 25 shares of a common stock in a pharmaceutical company. Last month the price of the stock was $35.48 per share. Today, the price of the stock is $27.36. By how much did the value of the stock decrease?
Enter your answers as a number like 105.
The value of the stock decreased by $203.
We have,
The initial value of the stock is:
= 25 shares X $35.48/share
= $887
The current value of the stock is:
= 25 shares x $27.36/share
= $684
The value of the stock decreased by:
= $887 - $684
= $203
Thus,
The value of the stock decreased by $203.
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How many moles of aluminum will be used when reacted with 1.35 moles of oxygen based on this chemical reaction? __Al + ___ O2 → 2Al2O3
I NEED IT ASAP
In this process, 1.35 moles of oxygen are combined with roughly 1.80 moles of aluminum.
The balanced chemical equation for the reaction between aluminum and oxygen is:
4 Al + 3 O₂ → 2 Al₂O₃
As a result, in order to create 2 moles of aluminum oxide (Al₂O₃), 3 moles of oxygen gas (O₂) must react with 4 moles of aluminum (Al).
We are given 1.35 moles of oxygen gas, thus we can calculate a percentage to estimate how many moles of aluminum are required using this information:
4 moles Al / 3 moles O₂ = x moles Al / 1.35 moles O
Solving for x, we get:
x = 4 moles Al * 1.35 moles O₂ / 3 moles O₂
x ≈ 1.80 moles Al
Therefore, approximately 1.80 moles of aluminum will be used when reacted with 1.35 moles of oxygen in this reaction.
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Change the ‘Conf level’ to 99% and run samples. The sample confidence intervals are longer (include more numbers in the interval)? Conceptually – why do the intervals have to be longer?
Conversely, a wider interval may be less precise, but it has a higher probability of capturing the true population parameter.
When the confidence level is increased from 95% to 99%, the sample confidence intervals will become longer. This is because the confidence level represents the probability of the true population parameter lying within the interval. As the confidence level increases, the probability of capturing the true population parameter also increases, which means the interval needs to be wider to account for the increased probability.
In other words, a higher confidence level requires a wider interval to ensure that the true population parameter is captured with a higher probability. This is a trade-off between precision and accuracy – a narrower interval may be more precise, but it also has a lower probability of capturing the true population parameter. Conversely, a wider interval may be less precise, but it has a higher probability of capturing the true population parameter.
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sara mcmahon purchased a new car 3 years ago for $24,500.00. the current estimated value is $17,900.00. annual variable costs this year were $895.60. insurance was $1,350.00, registration was $132.50, and loan interest totaled $1,080.00. she drove 12,540 miles this year. compute the cost per mile in dollars. round to the nearest hundredth.
The cost per mile to the nearest hundredth: $0.28 per mile.
Sara McMahon purchased a new car 3 years ago for $24,500.00, and the current estimated value is $17,900.00. The annual variable costs this year were $895.60, insurance was $1,350.00, registration was $132.50, and loan interest totaled $1,080.00. She drove 12,540 miles this year.
To compute the cost per mile, first, find the total cost for this year by adding the variable costs, insurance, registration, and loan interest: $895.60 + $1,350.00 + $132.50 + $1,080.00 = $3,458.10.
Next, divide the total cost by the number of miles driven: $3,458.10 ÷ 12,540 miles = $0.2757 per mile.
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Find a value of the standard normal random variable z, call it zo such that the following probabilities are satisfied. a. P(z ≤ zo) = 0.0151 b. P(-z0 ≤ z ≤ z0)=0.99 c. P(- zo ≤ z ≤ z0)=0.90 d. P(-z0 ≤ z ≤ zo) = 0.8154
e. P(-z0 ≤ z ≤ 0)= 0-2755 f. P(-2 < z < z)=0.9746 g. P(z >z0)=0.5 h. P (z ≤ zo)= 0.0043
The values of the standard normal random variable z, such that the probability of the following are satisfied: a. zo = -2.17; b. zo = 2.58; c. zo = 1.645; d. zo = 1.44.; e. zo = 0.37; f. zo = 1.96; g. zo = 0; h. zo = 0.
a. P(z ≤ zo) = 0.0151:
zo = -2.17.
b. P(-z0 ≤ z ≤ z0)=0.99
Since the standard normal distribution is symmetric, therefore, finding the z-score corresponding to probability: (1+0.99)/2 = 0.995.
zo = 2.58.
c. P(-zo ≤ z ≤ zo)=0.90:
Using the same reasoning as above, z-score for probability: (1+0.90)/2 = 0.95.
zo = 1.645.
d. P(-z0 ≤ z ≤ zo) = 0.8154:
probability of being outside and inside the range (-zo, zo) respectively:
P(z ≤ -zo) = P(z ≥ zo) = (1 - 0.8154)/2 = 0.0923
P(-zo ≤ z ≤ zo) = 1 - P(z ≤ -zo) - P(z ≥ zo) = 1 - 2(0.0923) = 0.8154
z-score for probability: (1+0.8154)/2 = 0.9077.
zo = 1.44.
e. P(-zo ≤ z ≤ 0) = 0.2755:
Using symmetry of standard normal distribution:
P(-zo ≤ z ≤ 0) = P(0 ≤ z ≤ zo) = (1 - 0.2755)/2 = 0.36225
zo = 0.37.
f. P(-2 < z < zo) = 0.9746:
zo = 1.96.
g. P(z > zo) = 0.5:
Since the standard normal distribution is symmetric:
P(z > zo) = P(z < -zo) = 0.5
zo = 0.
h. P(z ≤ zo) = 0.0043:
zo = 0.
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select the true statement(s) about hypothesis tests. a statistical hypothesis is always stated in terms of a population parameter. in a test of a statistical hypothesis, there may be more than one alternative hypothesis. in a test of a statistical hypothesis, we attempt to find evidence in favor of the null hypothesis. if the value of the test statistic lies in the nonrejection region, then the null hypothesis is true.
It does not mean that the null hypothesis is true.
The true statement about hypothesis tests is:
- A statistical hypothesis is always stated in terms of a population parameter.
The other statements are false:
- In a test of a statistical hypothesis, there may be more than one alternative hypothesis. This is not true. There should only be one alternative hypothesis.
- In a test of a statistical hypothesis, we attempt to find evidence in favor of the null hypothesis. This is not true. In a hypothesis test, we attempt to find evidence against the null hypothesis.
- If the value of the test statistic lies in the nonrejection region, then the null hypothesis is true. This is not true. If the value of the test statistic lies in the nonrejection region, we do not have enough evidence to reject the null hypothesis. It does not mean that the null hypothesis is true.
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Each of the 5 cats in a pet store was weighed. Here are their weights (in pounds). 6, 8, 7, 16, 9 Find the mean and median weights of these cats. If necessary, round your answers to the nearest tenth. (a) Mean: pounds (b) Median: pounds
If the 5 cats in the pet store weigh (in pounds) 6, 8, 7, 16, and 9, respectively, the mean and median weights are:
Mean = 9.2 poundsMedian = 8 pounds.What are the mean and the median?The mean refers to the average value, which is the quotient of the total value divided by the number of data items.
On the other hand, the median represents the middle value in the data set, when arranged according to ascending or descending order.
The total number of cats in the pet store = 5
The weights of the cats (in pounds) = 6, 8, 7, 16, 9
The total weight = 46 pounds (6, 8, 7, 16, 9)
The average (mean) weight = 9.2 pounds (46 ÷ 5)
The median weight = 8 (6, 7, 8, 9, and 16)
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if the drain for a 90 percent efficient furnace and the drain for the air conditioning coil are run with a common drain, the drain should be sized:
If the drain for a 90 percent efficient furnace and the drain for the air conditioning coil are run with a common drain, the drain should be sized large enough to accommodate the combined condensate flow from both systems.
To determine the appropriate size, you should:
1. Check the manufacturer's recommendations for both the furnace and the coil.
2. Calculate the maximum condensate flow from each system.
3. Add the two values together to find the total condensate flow.
4. Select a drain size that can handle the combined flow rate.
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Using the partial fractions technique, the function f(x) = 68x+168/ x^2+2x-24 can be written as a sum of partial fractions
We can express f(x) as a sum of partial fractions as: f(x) = (-10 / (x + 6)) + (78 / (x - 4))
To write the function f(x) = [tex](68x + 168) / (x^2 + 2x - 24)[/tex] as a sum of partial fractions, we first need to factor the denominator:
[tex]x^2 + 2x - 24 = (x + 6)(x - 4)[/tex]
So we can write:
f(x) = (68x + 168) / ((x + 6)(x - 4))
Now we can use the method of partial fractions to express f(x) as a sum of simpler fractions:
f(x) = A / (x + 6) + B / (x - 4)
where A and B are constants that we need to find. To do this, we can multiply both sides of the equation by the common denominator (x + 6)(x - 4):
(68x + 168) = A(x - 4) + B(x + 6)
Expanding and collecting like terms, we get:
68x + 168 = (A + B) x + (6B - 4A)
Since this equation holds for all values of x, we can equate the coefficients of x and the constant terms separately:
68 = A + B
168 = 6B - 4A
Solving these two equations simultaneously, we get:
A = -10
B = 78
Therefore, we can express f(x) as a sum of partial fractions as:
f(x) = (-10 / (x + 6)) + (78 / (x - 4))
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A faculty committee has decided to choose one or more students to join the committee. A total of 5 juniors and 6 seniors have volunteered to serve on this committee. How many different choices are there if the committee decides to select (a) one junior and one senior?
(b) exactly one student?
To select one junior and one senior there are 30 different choices and to select exactly one student there are 11 different choices.
(a) Given that there is a total of 5 juniors and 6 seniors volunteering for the committee, and the committee decides to select one junior and one senior, you can calculate the different choices by multiplying the number of juniors by the number of seniors. In this case, it would be 5 juniors * 6 seniors = 30 different choices.
(b) If the committee decides to select exactly one student, you would simply add the number of juniors and seniors together. In this case, it would be 5 juniors + 6 seniors = 11 different choices.
So, there are 30 different choices when selecting one junior and one senior, and 11 different choices when selecting exactly one student.
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Kim has 2,835 comic books. He must pack them into boxes to ship to a comic book store. Each box holds 45 comic books. How many boxes will he need to pack all of the books. ?
Answer:
The answer to your problem is, 63
Step-by-step explanation:
So we know that he has 2,835 comic books. He is also going to put them in boxes to ship it in a book store.
1 Box = 45 Comic Books
So in order to solve the problem we need to divide:
The expression includes:
2,835 ÷ 45 = 63
Thus the answer to your problem is, 63
Aaden wants to get a subscription to a library. There are two subscription options one of which charges a fixed 96 dollar annual fee and the other which charges 3 dollars per book he borrows.
what does point Q represent in this context?
a. A number of books and their cost where the subscription with the annual fee costs less
b. A number of books and their cost where the subscription the charges per book costs less
c. A number of books and their cost where both subscriptions cost the same
d. A number of books and their cost that is not possible with either subscription
Point R in this context represents the number of books borrowed and their cost where both subscription options cost the same.
The correct option is A.
Let's analyze the two subscription options:
Subscription with a fixed annual fee: This option charges a fixed $96 annual fee, regardless of the number of books borrowed.
The cost function for this subscription is a horizontal line at y = $96.
Subscription that charges per book borrowed: This option charges $3 per book borrowed. The cost function for this subscription is a linear function with a slope of $3.
When we plot the cost functions on a graph with the number of books borrowed on the x-axis and the cost on the y-axis, we will see that the two lines intersect at a point. This point of intersection is point R.
At point R, the cost of both subscriptions is the same. Therefore, the correct answer is c.
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The complete question:
Aaden wants to get a subscription to a library. There are two subscription options one of which charges a fixed 96-dollar annual fee and the other which charges 3 dollars per book he borrows.
What does point R represent in this context?
a. A number of books and their cost where the subscription with the annual fee costs less
b. A number of books and their cost where the subscription the charges per book costs less
c. A number of books and their cost where both subscriptions cost the same
d. A number of books and their cost that is not possible with either subscription
The complete question is given in the attached image.
Which of the following would have resulted in a violation of the conditions for inference? (a) If the entire sample was selected from one classroom (b) If the sample size was 15 instead of 25 (c) If the scatterplot of x = foot length and y = height did not show a perfect linear relationship (d) If the histogram of heights had an outlier (e) If the standard deviation of foot length was different from the standard deviation of height
A perfect linear relationship is essential for making accurate inferences in regression analysis. If the relationship between the variables is not linear, the results from the analysis may not be valid or reliable.
Option (a) would have resulted in a violation of the conditions for inference, as it would not be a representative sample of the population. Inference relies on the sample being representative of the population, and selecting the entire sample from one classroom would not be a random selection from the population.
Options (b), (c), (d), and (e) do not necessarily violate the conditions for inference. The sample size of 15 may affect the precision of the estimate, but it does not necessarily violate the conditions for inference.
A perfect linear relationship is essential for making accurate inferences in regression analysis. The scatterplot not showing a perfect linear relationship is expected in most cases, as perfect linear relationships are rare in real-world data. The histogram having an outlier may affect the distribution, but it does not necessarily violate the conditions for inference. And the standard deviation of foot length is different from the standard deviation of height is expected, as they are measuring different variables.
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In right triangle XYZ, angle y and angle z are complementary angles. If sin (y) = 0.423, cos (y) = 0.906, and tan (y) = 0.466, then cos (x)=
Find f(-3) for the piece-wise function.
The value of function f(- 3) for the piece-wise function is,
⇒ f (- 3) = - 1
We have to given that;
The piece-wise function is,
f (x) = (x + 2) ; if x < 2
= (x + 1) ; if x ≥ 2
Hence, At x = - 3;
Function is,
⇒ f (x) = x + 2
Hence, Substitute x = - 3;
⇒ f (- 3) = - 3 + 2
⇒ f (-3) = - 1
Thus, The value of function f(- 3) for the piece-wise function is,
⇒ f (- 3) = - 1
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Holt Park is divided into two sections. The swing section is 8 yards long and has an area of 112 square yards. The playground section has the same length as the swing section, but it is 3 yards wider. What is the total area of Holt Park?
Let a(n) be a sequence defined recursively as follows: a(0) .1 a(1) = 1 a{n+2) = a(n+1) - an) Find a(26)
If a(n) is a sequence defined recursively as follows: a(0) .1 a(1) = 1 a{n+2) = a(n+1) - a(n) then, a(26) is approximately equal to -1.8586.
To find a(26), we need to use the recursive definition of the sequence and work our way up from a(0) and a(1).
a(0) is given as 0.1, and a(1) is given as 1.
Now, we can use the recursive formula:
a(n+2) = a(n+1) - a(n)
to find the next term in the sequence.
a(2) = a(1) - a(0) = 1 - 0.1 = 0.9
a(3) = a(2) - a(1) = 0.9 - 1 = -0.1
a(4) = a(3) - a(2) = -0.1 - 0.9 = -1
a(5) = a(4) - a(3) = -1 - (-0.1) = -0.9
And so on. We can continue this process until we find a(26).
a(26) = a(25) - a(24) = -1.8586
Therefore, a(26) is approximately equal to -1.8586.
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Solve the problem. Show your work.
Reina heard on the 6:00 P.M. news that the temperature had
dropped 22° since 4:00 P.M. At 4:00 P.M., the temperature was 12º.
What is the temperature at 6:00 P.M.?
The average salary of an accountant is $ 71,000 a year. He just finished and his training which will increase his salary by 20%. How much more money he will make in next 10 years as compared to what he was earning without the training?
Answer:
After 10 years he will make 142 000$ more compared to what was earning without training
Sophie needed to get her computer fixed she took it to the repair store the technician at the store worked on the computer for four hours, and charged her $
127 for parts the total was $227 write and Solve an equation which can be used to determine X the cost of labor per hour
Answer:
Equation:
4x + 127 = 227
The per-hour cost for labor, x, was $25 per hour.
Step-by-step explanation:
We want to find the cost of labor for each hour. They worked on her computer for 4 hours. The per hour cost of labor we don't know, so we can call it x.
The repair shop charges x dollars per hour.
So the total LABOR charge is 4x.
The whole cost is:
Whole_Cost
= LABOR + PARTS
We know the whole cost, $227.
We know the parts, $127.
227 = 4x + 127
To solve, subtract 127
100 = 4x
divide by 4
25 = x
The cost per hour for labor is $25per hour.
Find the endpoints of the t distribution wit 2.5% beyond them in each tail if the samples have sizes n1 = 15 and n2 = 22
The endpoints of the t-distribution with 2.5% beyond them in each tail for the given sample sizes are approximately -2.0301 and 2.0301.
To find the endpoints of the t-distribution with 2.5% beyond them in each tail for the given sample sizes, follow these steps:
1. Determine the degrees of freedom: Since you have two samples with sizes n1 = 15 and n2 = 22, the degrees of freedom (df) will be (n1 - 1) + (n2 - 1) = 14 + 21 = 35.
2. Find the t-value corresponding to the 2.5% tail probability: Using a t-distribution table or an online calculator, look for the t-value that corresponds to a cumulative probability of 0.975 (since you want 2.5% in each tail, and the remaining 95% is between the tails). For df = 35, the t-value is approximately 2.0301.
3. Determine the endpoints: The endpoints of the t-distribution will be the positive and negative t-values found in step 2. So, the endpoints are approximately -2.0301 and 2.0301.
Thus, the endpoints of the t-distribution with 2.5% beyond them in each tail for the given sample sizes are approximately -2.0301 and 2.0301.
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A magician holds a standard deck of cards and draws one card. The probability of drawing the ace of diamonds is 1/52. What method of assigning probabilities was used?
a. classical method
b. objective method
c. subjective method
d. experimental method
The probability of drawing the ace of diamonds is determined by the number of possible outcomes (52 cards in a standard deck) and the number of favorable outcomes (1 ace of diamonds). Your answer: a. classical method
The method of assigning probabilities used in this scenario is the classical method, where the probability of an event is calculated by dividing the number of favorable outcomes by the total number of possible outcomes. In this case, there is only one favorable outcome (drawing the ace of diamonds) out of 52 possible outcomes (drawing any card from a standard deck of 52 cards).
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A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. The sample mean was 7 years with a standard deviation of 2 years. Assume the distribution of the time the employees have worked for the postal service is approximately normal. The hypotheses being tested are H0: μ = 7.5, HA: μ ≠ 7.5. A one-sample t test will be used.
What are the appropriate degrees of freedom for this test?
a) 19
b) 99
c) 100
d) 7
What is the value of the test statistic for the one-sample t?
a) 2.5
b) -2.5
c) 2
d) -0.25
What is the p-value for the one-sample t?
a. 0.02 > p-value > 0.01
b. 0.10 > p-value > 0.05
c. 0.0062
d. 0.01 > p-value > 0.005
e. 0.05 > p-value > 0.01
Suppose the mean and standard deviation obtained were based on a sample of size n=25 postal workers rather than 100.
What do we know about the value of the p-value?
a) It would be larger.
b) It would be unchanged because the variability or standard deviation is the same.
c) It would be unchanged because the difference between the sample mean and the hypothesized mean is the same.
d) It would be smaller.
What would you conclude about the population?
a) The true average years is greater than 7.5
b) The true average years is not equal to 7.5
c) The true average years is equal to 7.5
d) Not enough information
We reject the null hypothesis and conclude that the true average years are not equal to 7.5.
The appropriate degrees of freedom for this test is: b) 99
The degrees of freedom are calculated as n - 1, where n is the sample size (100 in this case).
So, [tex]n-1=100-1=99[/tex].
The value of the test statistic for the one-sample t is: b) -2.5
The test statistic is calculated using the formula: [tex]\frac{(sample mean - hypothesized mean)}{\frac{standard deviation}{\sqrt{sample size}}}[/tex], which is =[tex]\frac{(7 - 7.5)}{\frac{2}{\sqrt{100}}}[/tex] -2.5.
The p-value for the one-sample t is: e) 0.05 > p-value > 0.01
With a test statistic of -2.5 and 99 degrees of freedom, the p-value falls between 0.01 and 0.05.
If the mean and standard deviation were based on a sample of size n=25 postal workers rather than 100, the value of the p-value would be:
a) It would be larger.
A smaller sample size typically results in a larger p-value, making it more difficult to reject the null hypothesis.
Based on the given information, we can conclude about the population:
b) The true average years is not equal to 7.5
Since the p-value is between 0.01 and 0.05, it's significant at the 0.05 level, leading us to reject the null hypothesis and conclude that the true average years is not equal to 7.5.
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Which is a counterexample for the conditional statement? If two positive numbers are multiplied together, then the product will be greater than both of the two positive numbers. 2 x 4 5 x (−3)
The counterexample is 2/3 x 9 if two positive numbers are multiplied together and the result is bigger than either of the two positive numbers. d is the right answer, thus.
It is defined as the method through which we multiply, divide, add, and subtract numerical quantities. It contains the basic operators +, -,, and.
Multiplication is a useful tool for carrying out many common tasks, such as computing area, sales tax, and other geometric measurements.
The result will be greater than each of the two positive numbers if a two positive numbers when multiplied together.
If a two positive numbers in the stated condition are x and y,
xy > x
xy> y
The two figures are found to be 2/3 and 9.
=2/3 x 9 =6
Therefore, 2/3 x 9 will serve as the example that refutes the assertion "If two positive numbers when multiplied together, then perhaps the product would be greater than either of the two positive numbers
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The complete question is
The correct question is-
Which is a counterexample for the conditional statement?If two positive numbers are multiplied together, then the product will be greater than both of the two positive numbers.
a. 2 x 4
b. 5x(-3)
c. x
d. 2/3x9
Answer: a
Step-by-step explanation: