Question: The age when smokers first start from previous studies is normally distributed with a mean of 13 years old with a population standard deviationof 1.8

The age when smokers first start from previous studies is normally distributed with a mean of 13 years old with a population standard deviationof 1.8 years old. A survey of smokers of this generation was done to estimate if the mean age has changed. Thesample of 25 smokers found that their mean starting age was 13.7 years old. Find the 99% confidence interval of the mean.

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