Asked by Anonymous

An IQ test was administered to a random sample of 26 mental patients and the mean was found to be 99.7. For this test, the population values are known to be normally distributed and with a population standard deviation of 15. Construct a 90% confidence interval for the mean IQ of the population.

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Answered by Damon
http://davidmlane.com/hyperstat/z_table.html
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