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You wish to estimate the mean number of travel days per year for salespeople. The mean of a small pilot study was 150 days, with

You wish to estimate the mean number of travel days per year for salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 38 days. If you want to estimate the population mean with 90% confidence and a margin of error of 4 days, how many salespeople should you sample?

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