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Question: You construct a 100(1-α) percent confidence interval for the difference in population means of two independent, Normally Distributed populations, each with a known but different population variance represented by σ12 & σ22. A sample of the same size, n, is selected from each population. Assume that the current error term is E0. Find the sample size have to be if you wished to reduce this error term to 1/3(E0)?

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