75 Suppose you want to estimate the difference between two population means correct to within 2.2 with
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75 Suppose you want to estimate the difference between two population means correct to within 2.2 with probability
.95. If prior information suggests that the population variances are approximately equal to s1 2 = s22
= 15 and you want to select independent random samples of equal size from the populations, how large should the sample sizes, n1 and n2, be?
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