Question 276372: . In a British study around 1925, a group of 649 men with lung cancer were surveyed. A control group of the same size was established from a set of men who did not have lung cancer. The groups were matched according to ethnicity, age, and socioeconomic status. The statistics from the survey follow.
What type/Lung Cancer Cases/Controls/Totals
Smokers/647/622/1269
Non-smokers/2/27/29
a. What is the proportion of smoking in the group that has lung cancer 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, what is the probability that each person chosen has cancer?
d. Do you think that this data presents a strong association between lung cancer and smoking? Explain your answer.
e. Do you think that this evidence is conclusive that smoking causes lung cancer?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! In a British study around 1925, a group of 649 men with lung cancer were surveyed. A control group of the same size was established from a set of men who did not have lung cancer. The groups were matched according to ethnicity, age, and socioeconomic status. The statistics from the survey follow.
What type/Lung Cancer Cases/Controls/Totals
Smokers:::::::/647:::::::::::/622::::/1269
Non-smokers::::/2::::::::::::/27:::::/29
a. What is the proportion of smoking in the group that has lung cancer in the study? (647/649
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b. What is the proportion of smoking in the control group? 622/649
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c. If one person is chosen at random from each of the two groups, what is the probability that each person chosen has cancer?
Smoker Group: 647/1269
non-smok grp: 2/29
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d. Do you think that this data presents a strong association between lung cancer and smoking? Explain your answer.
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e. Do you think that this evidence is conclusive that smoking causes lung cancer?
Comment: d and e are discussion questions. I'll leave them up to you.
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Cheers,
Stan H.
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