Question: Suppose you want to estimate the difference between two populations means correct to within 1.8 with a 95% confidence interval. If prior information suggests that

Suppose you want to estimate the difference between two populations means correct to within 1.8 with a 95% confidence interval. If prior information suggests that the population variances are approximately equal to σ21 = σ22 = 14 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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