A paired difference experiment produced the following data:

nd = 9 x1 = 150 x2 = 157 xd = -7 sd 2 = 36

a. Determine the values of t for which the null hypothesis m1 - m2 = 0 would be rejected in favor of the alternative hypothesis m1 - m2 6 0. Use a = .10.

b. Conduct the paired difference test described in part a.

Draw the appropriate conclusions.

Exercises 7.29–7.52

c. What assumptions are necessary so that the paired difference test will be valid?

d. Find a 90% confidence interval for the mean difference md.

e. Which of the two inferential procedures, the confidence interval of part d or the test of hypothesis of part

b, provides more information about the difference between the population means?