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December 21, 2014

Homework Help: statistics

Posted by Sarah on Monday, September 13, 2010 at 7:58pm.

Scores on a certain test are normally distributed with a variance of 14. A researcher wishes to estimate the mean score achieved by all adults on the test. Find the sample size needed to assure with 95% confidence that the sample mean will not differ from the population mean by more than 2 units

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