Suppose we wish to test the hypotheses H0: ? = 15 H1: ? ? 15 where we know that ?² = 9.0. If the true mean is really 20, what sample size must be used to ensure that the probability of type II error is no greater than 0.10? Assume that ? = 0.05.
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025 From the Z table, Z = 1.96 Show more…
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