Statistics : Retail stores experience their heaviest returns on December 26 and December 27

Subject: Mathematics / Statistics
Question
Retail stores experience their heaviest returns on December 26 and December 27 each year. Most are
gifts that, for some reason, did not please the recipient. The number of items returned, by a sample of
30 persons at a large discount department store, are observed and the summary statistics below are
obtained. Determine a 98% confidence interval for the population mean number of items returned.

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