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The age when smokers first start from previous studies is normally distributed with a mean of 13 years old with a population standard deviation

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The age when smokers first start from previous studies is normally distributed with a mean of 13 years old with a population standard deviation of 2.1 years old. A survey of smokers of this generation was done to estimate if the mean age has changed. The sample of 28 smokers found that their mean starting age was 14.8 years old. Find the 99% confidence interval of the mean.

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