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The standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish to construct a 95% confidence interval for the mean weight of newborn elephants. Fifty newborn elephants are weighed. The sample mean is 244 pounds, and the sample standard deviation is 11 pounds. Construct a 95% confidence interval for the mean weight of newborn elephants. Hint: In this problem you are given the population standard deviation (15 pounds) and the sample standard deviation (11 pounds). Which should you use to construct the confidence interval? ANSWER: CI:( Problem 5 (Chapter 8) One hundred eight Americans were surveyed to determine the number of hours they spend watching television each month. It was revealed that they watched an average of 151 hours each month with a standard deviation of 32 hours. Construct a 99% confidence interval for the population mean hours spent watching television per month. ANSWER: CI: C Problem 6 (Chapter 8) A marketing company surveyed 200 randomly selected household and found that in 120 of them, the woman made the majority of the purchasing decision. Construct a 95% confidence interval for the population proportion of households where women made the majority of purchasing decisions. ANSWER: CI: C