SOLUTION: 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 1.8 years old. A survey of smoker
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Question 1154412: 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 1.8 years old. A survey of smokers of this generation was done to estimate if the mean age has changed. The sample of 35 smokers found that their mean starting age was 14.4 years old. Find the 90% confidence interval of the mean. Answer by fsdf(17) (Show Source):
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