9.2.6 -- Answer the following questions only.
1) Perform the test in part (a) using the three-step test.
2) Find the p-value for the test in (1). Based upon the p-value, do you reject H0? Why?
3) Find a 95\% CI for mu. Does it contain or exclude 3? Why?
4) Test H0: mu = 3 versus Ha: mu < 3 at the alpha=0.05 significance level using the three-step test.
5) Find the p-value for the test in (4).
6) Is there evidence that the mean wear significantly differs from 3? Why?
7) Is there evidence that the mean wear is significantly less than 3? Why?