A previous analysis of paper boxes showed that the the standard deviation of their lengths is 7 millimeters. A pakcer wishes to find the 90% confidence interval for the average length of a box. How
Many boxes does he need to measure to be accurate within 3 millimeters?
A) 6
B) 21
C) 15
D) 9

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The Answer of A previous analysis of paper boxes showed that the the standard deviation of their lengths is 7 millimeters. A pakcer wishes to find the 90% confidence interval for the average length of a box. How
Many boxes does he need to measure to be accurate within 3 millimeters?
A) 6
B) 21
C) 15
D) 9

A Previous Analysis of Paper Boxes Showed That the The Standard