A cookie manufacturer wants to estimate the length of time that her boxes of cookies spend in
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A cookie manufacturer wants to estimate the length of time that her boxes of cookies spend in the store before they are bought. She visits a sample of 15 supermarkets and determines the number of days since manufacture of the oldest box of cookies in the store. The mean is 54.8 days with a standard deviation of 11.3 days. A dotplot of the data indicates that the assumptions for constructing a confidence interval for the mean are satisfied. Construct a 99% confidence interval for the mean number of days.
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