Q#41

The mean age when smokers first start is 13 years old with a population standard deviation of 1.9 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS-electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 33 smokers found that their mean starting age was 12.2 years old. Do the data support the claim at the 5% significance level? What are the correct hypotheses? Ho: years H1: years Based on the hypotheses, find the following: Test Statistic z = (Give answer to at least 4 decimal places) Critical Values = (Give answer to at least 4 decimal places) Based on the above we choose to | Reject the null hypothesis The correct summary would be: There is enough evidence to support the claim that the claim that the mean age smokers first start is different than 13