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[Steps Shown] A department store wishes to estimate, with a confidence coefficient of 0.98 and a maximum error of $5, the true mean dollar value of purchases per

Question: A department store wishes to estimate, with a confidence coefficient of 0.98 and a maximum error of $5, the true mean dollar value of purchases per month by its customers with charge accounts. If the (population) standard deviation is $15, show that, to meet these specifications, the size of the sample should be $49.

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