The mean age when smokers first start is 13 years old with a population standard...
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The mean age when smokers first start is 13 years old with a population standard deviation of 2 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS-electronicnicotine delivery systems. A survey of smokers of this generation was done to see if the mean age haschanged. The sample of 34 smokers found that their mean starting age was 12.1 years old. Do the data support the claim at the 1% significance level?
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