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THE CIGARETTE ADVERTISEMENT CASE DS ModelAge
A random sample of 50 perceived age estimates for a model in a cigarette advertisement showed that x = 26.22 years and that s = 3.7432 years.
a. Use this sample to calculate a 95 percent confidence interval for the population mean age estimate for all viewers of the ad.
b. Remembering that the cigarette industry requires that models must appear at least 25 years old, does the confidence interval make us 95 percent confident that the population mean perceived age estimate is at least 25? Is the mean perceived age estimate much more than 25? Explain.
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