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A coal company wants to determine a 95% confidence interval estimate for the average

A coal company wants to determine a 95% confidence interval estimate for the average

A coal company wants to determine a 95% confidence interval estimate for the average

daily tonnage of coal that they mine. Assuming that the company reports that the standard

deviation of daily output is 200 tons, how many days should they sample so that the

margin of error will be 39.2 tons or less?

Rosa Parks 23-Nov-2017

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