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Confidence interval for the average length of a box

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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## Q : Find the required sample size

A major chain of food stores wants to determine the proportion of customers who buy on impulse. The company decided to use a sample large enough to estimate the proportion of impulse buyers within 2.5 percentage points of the true proportion 99% c