How large sample selected true mean differs from sample mean

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Reference no: EM13150152

n order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at an auto repair shop take per year. A previous study indicated that the standard deviation was 4.6 days. How large a sample must be selected if the company wants to be 85% confident that the true mean differs from the sample mean by no more than 1 day?

Reference no: EM13150152

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