Question

One of the few negative side effects of quitting smoking is weight gain. Suppose that the...

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 8 pounds. To estimate the mean weight gain, a random sample of 65 quitters was drawn and sample mean was found be 29 pounds. determine 90% confidence interval estimate

Confidence Interval = _______

Math   Statistics-And-Probability   
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Answer #1

90% confidence interval for is

- Z/2 * / sqrt(n) < < + Z/2 * / sqrt(n)

29 - 1.645 * 8 / sqrt(65) < < 29 + 1.645 * 8 / sqrt(65)

27.368 < < 30.632

90% CI is ( 27.368 , 30.632 )

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