Business Stats

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The mean number of travel days per year for salespeople employed by hardware distributors needs to be estimated with a 0.80 degree of confidence. For a small pilot study the mean was 176 days and the standard deviation was 12 days. If the population mean is estimated within three days, how many salespeople should be sampled?
a. 613
b. 756
c. 2,450
d. 27

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