How to find p-values Practice Test

and the sample mean is 12.

Select the answer so that both statements indicate a rejection of the null hypothesis at the 95% confidence level.

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?