For Exercises 11–16, do the following for the designated data:
15. Data in Exercise 7, confidence level = 95%
10.2.15
(a) (b) . We can estimate the difference in the population means of Population 1 and Population 2 to within 0.811 with 95% confidence. (c) (–1.811, −0.189). We are 95% confident that the difference in the population means of Population 1 and Population 2 lies between 2 1.811 and 20.189.