You need to estimate the mean number of travel days per year for sales people. The mean of a small pilot study was 160 days, with a standard deviation of 12 days. If you estimate the population mean within 3 days, how many sales people should you sample? Use the 80% [3] в. confidence level.

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The mean of a small pilot study was 160 days, with a standard deviation of 12 days. If you estimate
the population mean within 3 days, how many sales people should you sample? Use the 80%
confidence level.
You need to estimate the mean number of travel days per year for sales people.
[3]
Transcribed Image Text:в. The mean of a small pilot study was 160 days, with a standard deviation of 12 days. If you estimate the population mean within 3 days, how many sales people should you sample? Use the 80% confidence level. You need to estimate the mean number of travel days per year for sales people. [3]
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