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A previous analysis of paper boxes showed that the the standard deviation of their lengths is 13 millimeters. A packer wishes to find the 95% confidence interval for the average length of a box. How many boxes does he need to measure to be accurate within 4 millimeters?

A. 11

B. 58

C. 41

D. 29

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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