26) In a British study around 1950, a group of 649 men with lungcancer were surv
ID: 2915084 • Letter: 2
Question
26) In a British study around 1950, a group of 649 men with lungcancer were surveyed. A control group of the same size wasestablished from a set of men who did not have lung cancer. Thegroups were matched according to ethnicity, age, and socioeconomicstatus. The statistics from the survey follow.Lung Cancer Cases Controls Totals
Smokers 647 622 1269
Nonsmokers 2 27 29
a. What is the proportion of smoking in the group that has lungcancer in the study?
b. What is the proportion of smoking in the control group?
c. If one person is chosen at random from each of the two groups(smokers and nonsmokers), what is the probability that each personchosen has cancer?
d. Do you think that this data presents a strong associationbetween lung cancer and smoking? Explain your answer.
e. Do you think that this evidence is conclusive that smokingcauses lung cancer?
Explanation / Answer
Lungcancer
Cases
Controls
Totals
Smokers
647
622
1269
NonSmokers
2
27
29
Totals
649
649
1298
Lungcancer
Cases
Controls
Totals
Smokers
647
622
1269
NonSmokers
2
27
29
Totals
649
649
1298
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