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An IQ test is designed so that the mean is 100 and the standard deviation is 13 for the population of normal adults. Find the

An IQ test is designed so that the mean is 100 and the standard deviation is 13 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 7 IQ points of the true mean. Assume that =13 .

The required sample size is

nothing

. (Round up to the nearestinteger.)

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