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The manager of a hardware store wants to estimate the average amount of purchases made at the store. The margin of error of the estimate

The manager of a hardware store wants to estimate the average amount of purchases made at the store. The margin of error of the estimate must not exceed $4.00 with a confidence level of 95%. The manager does not know the standard deviation of the amounts, but he expects it to be around $25.00. How big should the sample be?

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