Mathematics, 20.11.2019 21:31 Pinkywoo

From generation to generation, the average age when smokers first start to smoke varies. however, the standard deviation of that age remains constant at around 2.1 years. a survey of 39 smokers of this generation was done to see if the average starting age is at least 19. the sample average was 18.2 with a sample standard deviation of 1.3. do the data support the claim at the 5% level?

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From generation to generation, the average age when smokers first start to smoke varies. however, th...