Question: Consider the hypothesis test:

H0 :????7.3

Ha :????7.3.

You took a sample of 100 subjects and found that the sample mean was 7.1, with a sample standard deviation of 2.1. You are testing at the significance level ????0.05.

a. Find the border value between the rejection region and the non-rejection region.

b. Using this border value, what does your sample mean tell you? Is the null hypothesis rejected or not?

c. Find the value of ??when the true mean is 7.0 instead of 7.3. What is the power of the test in this circumstance?

d. Find the value of ??when the true mean is 6.8 instead of 7.3. What is the power of the test in this circumstance?