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A Previous Analysis of Paper Boxes Showed That the The Standard

Question 21
Multiple Choice
arrowQuestion 21arrow
Multiple Choice

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) 29
B) 58
C) 41
D) 11

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