Question

From generation to generation, the mean 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 44 smokers of this generation was done to see if the mean starting age is at least 19. The sample mean was 18.2 with a sample standard deviation of 1.3. Do the data support the claim at the 5% level?

State the distribution to use for the test. (Round your answers to four decimal places.) x-bar ~ ( ? , .3166 )

the bold is correct

Answer 1

from above distribution to use for the test ~N(19,0.3166)