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From generation to generation, the mean agewhen smokers first start to smoke varies.However, the standard...

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From generation to generation, the mean agewhen smokers first start to smoke varies.However, the standard deviation of that ageremains constant of around 2.1 years. A survey of40 smokers of this generation was done to see ifthe mean starting age is at least 19. The samplemean was 18.1 with a sample standard deviationof 1.3. Do the data support the claim at the 5%level?

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