You need to estimate the mean number of travel days per year for outside salespe

Question

You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 50 days.

If you must estimate the population mean within 4 days, how many outside salespeople should you sample? Use the 99% confidence level. (Use z Distribution Table.) (Round up your answer to the next whole number.)

You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 50 days.

Explanation / Answer

Solution:

Here is the formula

Margin of error = (z*)(s) / sqrt n

Now insert the values from the problem ...

4 days = (2.58)(50 days) / sqrt n, now solve for n ...

n = 1040

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