Can someone pls help me out

Answer:

The 95% t-confidence interval for the difference in mean is approximately (-2.61, 1.16), therefore, there is not enough statistical evidence to show that there is a change in waiting time, therefore;

The change in the call waiting time is not statistically significant

Step-by-step explanation:

The given call waiting times are;

24.16, 20.17, 14.60, 19.79, 20.02, 14.60, 21.84, 21.45, 16.23, 19.60, 17.64, 16.53, 17.93, 22.81, 18.05, 16.36, 15.16, 19.24, 18.84, 20.77

19.81, 18.39, 24.34, 22.63, 20.20, 23.35, 16.21, 21.73, 17.18, 18.98, 19.35, 18.41, 20.57, 13.00, 17.25, 21.32, 23.29, 22.09, 12.88, 19.27

From the data we have;

The mean waiting time before the downsize, [tex]\overline x_1[/tex] = 18.7895

The mean waiting time before the downsize, s₁ = 2.705152

The sample size for the before the downsize, n₁ = 20

The mean waiting time after the downsize, [tex]\overline x_2[/tex] = 19.5125

The mean waiting time after the downsize, s₂ = 3.155945

The sample size for the after the downsize, n₂ = 20

The degrees of freedom, df = n₁ + n₂ - 2 = 20 + 20  - 2 = 38

df = 38

At 95% significance level, using a graphing calculator, we have; [tex]t_{\alpha /2}[/tex] = ±2.026192

The t-confidence interval is given as follows;

[tex]\left (\bar{x}_{1}- \bar{x}_{2} \right )\pm t_{\alpha /2}\sqrt{\dfrac{s_{1}^{2}}{n_{1}}+\dfrac{s_{2}^{2}}{n_{2}}}[/tex]

Therefore;

[tex]\left (18.7895- 19.5152 \right )\pm 2.026192 \times \sqrt{\dfrac{2.705152^{2}}{20}+\dfrac{3.155945^2}{20}}[/tex]

(18.7895 - 19.5125) - 2.026192*(2.705152²/20 + 3.155945²/20)^(0.5)

The 95% CI = -2.6063 < μ₂ - μ₁ < 1.16025996668

By approximation, we have;

The 95% CI = -2.61 < μ₂ - μ₁ < 1.16

Given that the 95% confidence interval ranges from a positive to a negative value, we are 95% sure that the confidence interval includes '0', therefore, there is sufficient evidence that there is no difference between the two means, and the change in call waiting time is not statistically significant.

In order:

72 x 8 = 576

47 x 7 = 329

(7 x 3) x 7

21 x 7 = 147

Answer:

x^4

Step-by-step explanation:

any variable when multiplied by the same variable will result in the exponent to increase.

The value of x in the stated triangle is 6.32 based on given dimensions.

The stated triangle is right angled triangle and hence will follow Pythagoras theorem. The calculation will be done using the Pythagoras formula as stated -

Perpendicular² = Base² + Height²

Keep the values in formula to find the value of x

x² = 2² + 6²

Taking square on the Right Hand Side of the equation

x² = 4 + 36

Add the digits on Right Hand Side of the equation

x² = 40

x = ✓40

Taking square root

x = 6.32

Hence, the length of x is 6.32.

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Answer:

X=37

Step-by-step explanation:

180-45-98=37

Answer:

  y = -2x + 11

Step-by-step explanation:

Slope point equation:

y - y1 = m(x -x1)

y1 = 7  ; x1 = 7 , m = -2

y - 7 = -2(x - 2)

y - 7 = -2x -2*(-2)

y -7 = -2x + 4

   y = -2x + 4 + 7

   y = -2x + 11

Answer:

where is the figure? to calculate the surface area

Answer: i think a nd c

Step-by-step explanation:

Answer:

each tangent is 20.785 ft long

Step-by-step explanation:

since the tangent forms a right angle with the radius, and a line from P to O bisects the 60° angle:

tan 30° = 12/x

0.5774 = 12/x

0.5774x = 12

x = 20.785 ft

Answer:

10c - 5

Step-by-step explanation:

" the product" tells you you're multiplying 10 and c, and "5 less" means subtracting 5 from the other part of the expression.

Answer:

k=-0.25

Step-by-step explanation:

Answer:

it rose three eighths of a pound

Answer:

Yes, they are proportional

Step-by-step explanation:

First, simplify each fraction

30/80 can be simplified by dividing each number by 10

30/80

= 3/8

24/64 can be simplified by dividing each number by 8

24/64

= 3/8

So, each fraction will simplify to 3/8, meaning that they are proportional.

Answer:

hi

Step-by-step explanation:

i think QR=24

QT=12

ST=37

hope it helps

Answer:

46.5

Step-by-step explanation:

0.7 = 7/10 = 14/20

The missing numbers are 10 and 14

Answer: 7/10 14/20

Step-by-step explanation: Convert to a mixed number by placing the numbers to the right of the decimal over

10. Reduce the fraction

Answer:

2x²+7x-4

Step-by-step explanation:

2x²+8x-x-4

2x²+7x-4

Answer:

2x² + 7x - 4

Step-by-step explanation:

(2x + 1)(x + 4)

Each term in the second factor is multiplied by each term in the first factor, that is

2x(x + 4) - 1 (x + 4) ← distribute parenthesis

2x² + 8x - x - 4 ← collect like terms

= 2x² + 7x - 4

Answer:

The first blank is 9  for 9 cucumbers

The second blank is 8 dollars

Step-by-step explanation:

We can use ratios to solve

3 cucumbers           x cucumbers

--------------------- = ----------------------

2 dollars                   6 dollars

Using cross products

3*6 = 2x

18 = 2x

Divide by 2

18/2 = 2x/2

9 =x

We need 9 cucumbers

For the third row

3 cucumbers           12 cucumbers

--------------------- = ----------------------

2 dollars                   y dollars

Using cross products

3*y = 2*12

3y = 24

Divide by 3

3y/3 = 24/3

y = 8

We need 8 dollars

Answer:

I don't know

Step-by-step explanation:

Dapat kasi mag-aaral ka mabuti para ikaw ay magiging matalino

Answer:The Cost of one rose bush is $11 and the cost of one shrub is $5

Step-by-step explanation: Well it took me 40 mins to get the answer and yes i know it shouldn't take that long but for a freshmanbut wow that was hard  , well 11 x 8 = 88 and 5 x 8 = 40 add that up 128 and for the 2nd question 11x 11= 121 then 5x 12= 60 and when you add it up you got 181 so what would the main numbers be that you used for both problems? it would be 11 for one  rose  and 5  for one shrubs. thanks for wasting my time on a hard question that took me 40 mins to answer

Answer: look i learned a lesson to never cheat and dont do the same mistake you too plz here is a thing that can help you answer your question

Step-by-step explanation:

here is the the link that can help you do the questions

am not the link people

https://teachers.henrico.k12.va.us/math/HCPSAlgebra1/Documents/9-4/SolveSysByElimMult.ppt

Answer: the answer is 64.

Step-by-step explanation: I just did the practice.

Answer: 2, 1.5 , -0.75

(b) [tex]4x-3y-10=0[/tex]

Step-by-step explanation:

Given

line is [tex]3x+4y-6=0[/tex]

Converting it into intercept form

[tex]\Rightarrow 3x+4y=6\\\\\Rightarrow \dfrac{3x}{6}+\dfrac{4y}{6}=\dfrac{6}{6}\\\\\Rightarrow \dfrac{x}{2}+\dfrac{y}{1.5}=1[/tex]

So, the x-intercept is [tex]2[/tex] and y-intercept is [tex]1.5[/tex]

The slope is given by

[tex]-\dfrac{\frac{1}{2}}{\frac{1}{1.5}}=-0.75[/tex]

(b) the line perpendicular to the above line and passing through [tex](1,-2)[/tex]

The slope of the required line

[tex]m=-\dfrac{1}{-0.75}\\\\m=\dfrac{4}{3}[/tex]

Equation of the line is given by

[tex]\Rightarrow \dfrac{y-(-2)}{x-1}=\dfrac{4}{3}\\\\\Rightarrow 3y+6=4x-4\\\Rightarrow 4x-3y-10=0[/tex]

Answer:

3, 12, 48 ... =

3(4)^0, 3(4)^1, 3(4)^2 ... =

3(1), 3(4), 3(16) ....

3, 12, 48 ...

it's geometric with common ratio of 4.  each term is 4 times the prior termStep-by-step explanation:

Answer:

Soln

At first find the total area of figure then decrease the area with shaded region.

You can get answers.

Answer: son, estoy, estas, es, son, estamos, son, estan

Step-by-step explanation:

If it is talking about someone else then try to use, son. Like the first one. For words for yo use words like estoy. I don´t really know how to explain them but they make sense.

Answer:

I only know the first question, If you leave that money for 1 year it would equal $480 basically,  $300 x 1.6 = $480.

Step-by-step explanation:

The required amount in your account after 2 years will be $337.08.

Compound interest is the interest on deposits computed on both the initial principal and the interest earned over time.

Here,
If you deposit $300 in an account with a 6% interest rate, the amount in your account after 1 year can be calculated as follows:

Find the interest earned after one year:

Interest earned = (6/100) x 300 = $18

Add the interest earned to the original amount:

Total amount after 1 year = $300 + $18 = $318

Therefore, the amount in your account after 1 year will be $318.

If you leave this money in the account for another year, the amount in your account after 2 years can be calculated as follows:

Find the interest earned after two years:

Interest earned in year 1 = $18

Interest earned in year 2 = (6/100) x $318 = $19.08

Add the interest earned to the original amount and the interest earned in year 1:

Total amount after 2 years = $300 + $18 + $19.08 = $337.08

Therefore, the amount in your account after 2 years will be $337.08.

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Answer:

65 percent

Step-by-step explanation:

The solution is 65 %

The percentage of people who were satisfied with the car is 65 %

What is Percentage?

A percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, %

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data ,

Let the percentage of people who were satisfied with the car be = P

Now , the number of people who were satisfied with the car = 1625

The number of people who were somewhat satisfied with car = 665

The number of people who were not satisfied with the car = 210

The total number of people surveyed = number of people who were satisfied + number of people who were somewhat satisfied + number of people who were not satisfied

Substituting the values in the equation , we get

The total number of people surveyed = 1625 + 665 + 210

The total number of people surveyed = 2500 people

So , the percentage of people who were satisfied with car P = number of people who were satisfied with the car / total number of people surveyed

Substituting the values in the equation , we get

Percentage of people who were satisfied with car P = ( 1625 / 2500 ) x 100

Percentage of people who were satisfied with car P = 0.65 x 100

Percentage of people who were satisfied with car P = 65 %

Therefore , the value of P is 65 %

Hence , the percentage is 65 %

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using cos to get x

cos -1 of 13/20

= 49.45

then y = 40.54° using sin y= opp /hyp =13\15

then the sin-1 of 13/20 =40.54 •

Answer:

assuming that you want us to add them together here's the answer i got-

5y²−3y+3

Step-by-step explanation:

let us simplify step-by-step-

4y²−2y−5+y²(−y)+8

= 4y²+(−2y)+(−5)+y²+(−y)+8

combining like terms-

=4y²+−2y+−5+-y²+−y+8

=(4y²+y²)+(−2y+−y)+(−5+8)

=5y²+−3y+3

good luck :)

i hope this helps

brainliest would be highly appreciated

have a nice day!

Answer:

B

Step-by-step explanation:

You multiply the 3 numbers.