Discussion:
Q: A doctor suspected that smokers between 40 and 50 with lung disease had been smoking on average more than 20 years. A sample of 10 smokers gave the following results:
22
2
19
25
24
26
23
2
21
22
Using a 1% significance level is there sufficient evidence to justify the doctors belief? Is there sufficient evidence to Justify it at the a = .1 level?