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April 17, 2014

Homework Help: math

Posted by Yo on Tuesday, February 28, 2012 at 10:03pm.

A traffic engineer plans to estimate the average number of cars that pass through an intersection each day. Based on previous studies the standard deviation is believed to be 52 cars. She wants to estimate the mean to within 10 cars with 90 percent confidence. The needed sample size for n is:

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