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October 2, 2014

Homework Help: statistics

Posted by Valerie on Tuesday, November 2, 2010 at 9:02pm.

A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 4.13, how large a sample is needed to get the desired information to be accurate within 0.68 decibels?

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