# Question

One of the few negative side effects of quitting smoking is weight gain. Suppose that the weight gain in the 12 months following a cessation in smoking is normally distributed with a standard deviation of 6 pounds. To estimate the mean weight gain, a random sample of 13 quitters was drawn; their recorded weights are listed here. Determine the 90% confidence interval estimate of the mean 12-month weight gain for allquitters.

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