How much time do Americans spend eating or drinking? Suppose for a random sample of 1001 Americans, the mean time eating or drinking per day is 1.22 hours with a sample standard deviation of 0.65 hours. (a) Construct and interpret a 99% confidence interval for the mean amount of time Ameri- cans spend eating or drinking per day. (b) Suppose you want to conduct your own survey. Using the sample standard deviation above, how large of a sample is required to estimate the mean time Americans spend eating or drinking per day within 15 minutes of the true mean and with 95% confidence?

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