Question: Let 2 = 16 be the variance of a normal population from which a random sample is chosen. How large should the sample size be

Let σ2 = 16 be the variance of a normal population from which a random sample is chosen. How large should the sample size be for testing H0: μ = 25 versus Ha: m = 24, in order that α = 0.05 and β = 0.05?

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