75. For the data of Exercise 74, we now want to test the hypothesis of equal population means.

a. Carry out a two-tailed test using the method based on the theorem of Section 10.2. Although this test requires normal data, it will work fairly well for moderately nonnormal data. Nevertheless, you should check the data for normality to see if the test is justi ed.

b. Carry out a two-tailed permutation test for the hypothesis of equal population means.

c. Compare the results of

(a) and (b). Would you expect them to be similar for the data of this problem? Discuss their relationship to the results of Exercise 74. Summarize your conclusions about the effectiveness of blueberries.