13.5 In random samples of 25 from each of two normal populations, we found the following statistics:
x-bar1 = 524 s1 = 129
x-bar2 = 469 s2 = 141
a. Estimate the difference between the two population means with 95% confidence. b. Repeat part (a) increasing the standard deviations to s1 = 255 and s2 = 260. c. Describe what happens when the sample standard deviations get larger. d. Repeat part (a) with samples of size 100. e. Discuss the effects of increasing the sample size.
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