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find the sample size needed to estimate the mean age of movie patrons such that it can be said with 95% confidence that the sample

find the sample size needed to estimate the mean age of movie patrons such that it can be said with 95% confidence that the sample mean is within 1.5 years of the population mean. Assume that o=19.2 years, based on a previous report. Could the sample be obtained from one movie at one theater?

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