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What is the sample size needed to estimate a mean

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Reference no: EM132401590

a) What is the sample size needed to estimate a mean to within +-5 with 95% confidence if the standard deviation is assumed to be 18?

b) What is the sample size needed to estimate a population proportion to within +-0.04 with 99% confidence? (No planing value is provided for the population proportion p*)

Reference no: EM132401590

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