Problem 8.41 Refer to the data in Problem 1.64. Use the two sample t test to determine the effect, if any, of the word processor program on the length of time it takes to type a text file. Assume the data are normally distributed with a common variance; use α = 0.05. In detail:

(a) Compare the differences between word processing programs A and B. Describe the null and alternative hypotheses, and state your conclusions.

(b) Repeat part

(a) but use the Wilcoxon rank sum test.