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A major online retailer wishes to know the average number of returns processed at each of...

A major online retailer wishes to know the average number of returns processed at each of its return centers every week, accurate to within 75 returns. If the standard deviation is 400 returns each week, how large a sample size will be needed in order to achieve the desired precision at the 5% significance level?

Math   Statistics-And-Probability   
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TOPIC:Finding the required sample size for the given confidence level and the allowable margin of error.

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