Multiple Choice
A previous analysis of paper boxes showed that the the standard deviation of their lengths is 15 millimeters. A packer 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) 25
B) 97
C) 69
D) 41
Correct Answer:
Verified
Correct Answer:
Verified
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