Explain a market researcher plans to sample sales receipts

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Reference no: EM1363435

A market researcher plans to sample sales receipts at a natural food store to estimate the average size (in dollars) of a customer purchase. Previous analysis suggests that the standard deviation of the purchase amount is approximately $25.

In order to calculate a 95% confidence interval of total width less than $5, how many sales records should the researcher include in her sample?

Reference no: EM1363435

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