a) In a recent study of 100 eighth graders, the mean number of hours per week they watched television was 18.6 hours. A previous study found ? = 4.5 hours. Construct a 99% confidence interval for the population mean number of hours per week eighth graders watch television. Show how you get the answer. b) Does your interval suggest that eight graders watch less than 20 hours of television per week? Explain.

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