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 1.6 years old. A survey of smokers of generation Z was done to estimate if the mean age has changed. The sample of 27 smokers found that their mean starting age was 15 years old. Find the 95% confidence interval of the mean. < Select an answer < Do not round in between steps. Round answers to at least 3 decimal places.

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