What method to use on Statistics problem?

Answers:0   |   LastUpdateAt:2012-10-21 19:20:32  

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Suetusi
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To set rates , an insurance company is trying to estimate the number of sick days that full-time workers in an auto shop take per day . A previous study indicated that the standard deviation was 2.8 days . What sample size should be selected if the company wants to have 95 % confidence that the true mean is within 1 day of the sample mean .
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