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A random sample of 38 persons who shopped on black Friday was collected to estimate the average number of hours spent shopping on black Friday.
A random sample of 38 persons who shopped on black Friday was collected to estimate the average number of hours spent shopping on black Friday. If the mean hour is 6.08 and the standard deviation is 2.755. How many shoppers should be included in a sample to estimate the average hour if you want the estimate to deviate no more than 0.5 hour from the true mean?
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