Test: AP Statistics

1.

We are testing the hypothesis that the average gas consumption per day in Billings, Montana is greater than 7 gallons per day; we want 95% confidence.

We sample 30 drivers. The average is 8.4, and the sample standard deviation is 4.29. 

Our null hypothesis is

1) What is the Z-value for a 1-tailed test at 95%?

2) What is the Z-value for our sample mean of 8.4?

3) What is the p-value for our sample mean of 8.4?

4) Do we reject the null hypothesis? 

1) 1.64

2) 1.9

3) .028

4) Yes

1) 1.64

2) 1.8

3) .036

4) Yes

1) 1.64

2) 1.55

3) .067

4) No

1) 1.64

2) 1.95

3) .020

4) Yes

1) 1.64

2) 1.44

3) .083

4) No

1/5 questions

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