Homework Help: statistics

Posted by vina on Saturday, June 25, 2011 at 9:15pm.

Scores on a certain test are normally distributed with a variance of 91.
A researcher wishes to estimate the mean score achieved by all adults on the test.
Find the sample size needed to assure with 95.44 percent confidence that the
sample mean will not differ from the population mean by more than 2 units.

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