Does the relative risk you calculated in (a) suggest that those people working in the factory have an increased or a decreased risk of developing lung cancer? Why?

You are studying whether factory workers’ exposure to industrial smoke contributes to the development of lung cancer. You perform a cohort study of people who work in the factory and people who do not work in the factory, and you obtain the following results:

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Exposure to Industrial Smoke Contracted Lung Cancer Do Not Have Lung Cancer
Yes 40 20
No 20 20

a. Calculate the relative risk.
b. Does the relative risk you calculated in (a) suggest that those people working in the factory have an increased or a decreased risk of developing lung cancer? Why?
c. If you were conducting a community educational program dealing with industrial pollution, how would you use the information you obtained and calculated?
d. Name one confounding variable could contribute to generating the statistics in the table? How could you further explore the significance of this confounding variable?
e. The information collected for this study was collected by 5 different people. What type of error could result from this situation?

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