Question 25

1pts

You've conducted a hypothesis test and now you're at the last step: the conclusion.You've for a test statistic of z = 1.87 and a critical value of +2.33 (i.e., a one tailed test).Based on this information, what would you conclude?

Group of answer choices

fail to reject the null hypothesis

reject the null hypothesis

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Question 26

1pts

You've conducted a hypothesis test and now you're at the last step: the conclusion.You've for a test statistic of t = -0.256 and a critical value of -3.268 (i.e., a one tailed test).Based on this information, what would you conclude?

Group of answer choices

fail to reject the null hypothesis

reject the null hypothesis

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Question 27

1pts

Say that the population mean for the average number of times an ASU downtown student rides the light rail in a month is 3.You think that the number is much higher than that.You collect a sample of 25 ASU Downtown students and find that the sample average is 5.5, with a standard deviation of 1.1.Conduct a hypothesis test to determine if the true mean is higher.Use a significance level of 0.05.

In the above hypothesis test, what is the alternative hypothesis?

Group of answer choices

H1: > 3

H1: < 3

H1: > 5.5

H1: < 5.5

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Question 28

1pts

We know that, on average, most people drive about 10 miles a day.We think that people living in Phoenix have a different average than this. We talk to 250 people that live Phoenix, and find that their average number of miles they drive per day is 15, with a standard deviation of 3.7.Conduct a hypothesis test to see if people in Phoenix drive a different amount; use a significant level of 0.05.

What is the alternative hypothesis?

Group of answer choices

H1: 10

H1: 15

H1:> 10

H1:> 15

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Question 29

1pts

Say that the population mean for the average number of times an ASU downtown student rides the light rail in a month is 3.

You think that the number is much higher than that.

You collect a sample of 25 ASU Downtown students and find that the sample average is 5.5, with a standard deviation of 1.1.

Conduct a hypothesis test to determine if the true mean is higher.

Use a significance level of 0.05.

In the above hypothesis test, what is the test statistic?

Group of answer choices

11.36

-8.14

12.56

10.32

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Question 30

1pts

Police officers often have to call Child Protection Services (CPS) when responding to a call for service.

However, when they encounter CPS workers, they are not always satisfied.

The national average level of satisfaction police officers have with CPS workers is 6.5 (on a scale of 0-10, with 10 being most satisfied).

The head of CPS in Phoenix wants to see if the satisfaction levels of the police with CPS are different in Phoenix. He talks to 200 Phoenix police officers and finds the average satisfaction level is 7.8, with a standard deviation of 2.7.

Conduct a hypothesis test to determine if the Phoenix police officers' average level of satisfaction is truly different than the national average.

Use a significance level of 0.01.

In the above hypothesis test, what is the test statistic?

Group of answer choices

6.81

-24.25

7.58

6.99