Question: Suppose that we wish to test H0: 1 2 versus H1: 1 2, where 2 1 and 2 2 are known. The total sample

Suppose that we wish to test H0: 1 2 versus H1: 1 2, where 2 1 and 2 2 are known. The total sample size N is to be determined, and the allocation of observations to the two populations such that n1 n2 N is to be made on the basis of cost. If the cost of sampling for populations 1 and 2 are C1 and C2, respectively, find the minimum cost sample sizes that provide a specified variance for the difference in sample means.

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