[Steps Shown] IQ scores form normal distributions with σ=15. However, the mean IQ varies from one population to another. For example, the mean IQ
Question: IQ scores form normal distributions with \(\sigma=15\). However, the mean IQ varies from one population to another. For example, the mean IQ for registered voters is different from the mean for nonregistered voters. A researcher would like to use a sample to obtain information about the mean IQ for the population of licensed clinical psychologists in the state of California. Which sample mean should provide a more accurate representation of the population: a sample of \(n=9\) or a sample of \(n=25\) ? In each case, compute exactly how much error the researcher should expect between the sample mean and the population mean.
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