Chapter 10.3, Problem 73E

In each of Exercises 10.73–10.78, we have provided summary statistics for independent simple random samples from two populations. In each case, use the nonpooled t-test and the nonpooled t-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval.

10.73 ${\bar{x}}_1$ = 10, s₁ = 2.1, n₁ = 15, ${\bar{x}}_2$ = 12, s₂ = 5, n₂ = 15

1. a. Two-tailed test, ・ = 0.05
2. b. 95% confidence interval