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Would the required n go up or down

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a.Suppose we are sampling from a N(μ,144) distribution. How large must n be so that a 90% CI for μ has length (left endpoint to right endpoint) equal to 0.5?

b.In the same situation as (a), suppose instead that σ2 = 100. Would the required n go up or down?

Reference no: EM132155807

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