Decide whether the problem requires a confidence interval or hypothesis test, and determine the variable of interest.
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Decide whether the problem requires a confidence interval or hypothesis test, and determine the variable of interest. For any problem requiring a confidence interval, state whether the confidence interval will be for a population proportion or population mean. For any problem requiring a hypothesis test, write the null and alternative hypothesis.
Is the dispersion of IQ scores among undergraduate students lower than that of the general population, 15?
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