Question: Suppose that we are testing H0: 1 = 2 versus H1: 1  2 and we plan to use equal sample sizes from the two

Suppose that we are testing H0: μ1 = μ2 versus H1: μ1  μ2 and we plan to use equal sample sizes from the two populations. Both populations are assumed to be normal with unknown but equal variances. If we use a = 0.05 and if the true mean μ1 = μ2 + what sample size must be used for the power of this test to be at least 0.90?

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