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Confidence interval for mean

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A previous analysis of paper boxes showed that the the standard deviation of their lengths is 9 millimeters. A packer wishes to find the 99% confidence interval for the average length of a box. How many boxes does he need to measure to be accurate within 2 millimeters?

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Step by step method for computing confidence interval is given in the answer.

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A previous analysis of paper boxes showed that the standard deviation of their lengths is 9 millimeters. A packer ...

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