In each of Exercises 10.23-10.26, we have provided summary statistics for indepe

Question

In each of Exercises 10.23-10.26, we have provided summary statistics for independent simple random samples from two populations. Preliminary data analyses indicate that the variable under consideration is normally distributed on each population. Decide, in each case, whether use of the pooled t-test and pooled t-interval procedure is reasonable. Explain your answer. In each of Exercises 10.27-1032, we have provided summary statistics for independent simple random samples from two populations. In each case, use the pooled t-test and the pooled t-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval.

Explanation / Answer

10.24 Since s1 = 79.4 and s2 = 10.5 differ somuch, the assumption of equal variance does not apply. The pooledt-test computes a SD assuming the variances are the same in the 2populations.

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