An insurance company is trying to estimate the average number of sick days that full-time food service workers use per year. A pilot study found the standard deviation to be 2.5 days. How large a sample must be selected if the company wants to be 95% confident of getting an interval that contains the true mean with a maximum error of 1 day?
The question belongs to Statistics and it is about estimating the average number of sick days that a full time food service workers take per year. For this study, an approximate size of the sample needs to be decided.
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