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 36 days.

If you must estimate the population mean within 6 days, how many outside salespeople should you sample? Use the 95% confidence level. (Use Student's 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 36 days.

Explanation / Answer

For 95%, z = 1.96

d=6

sd=36

Sample size = (z2 * s2)/d2

= (1.962 * 362)/62

=138.2976

The sample size required= 139

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