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The age when smokers first start from previous studies is normally distributed with a mean...

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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 Select an answer Do not round in between steps Round answers to at least 3 decimal places

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