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Problem: Suppose that, for the American entire population, 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.
16 23 8 2 14 22 18 11 10 19 5 8 15
(a) To perform an estimation in this problem, should I use the t or the z table? Why?
(b) Determine the 90% confidence interval estimate of the mean 12-month weight gain for all quitters.
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