Suppose 100 lungcancer cases and 200 age and sexmatched cont

Suppose 100 lung-cancer cases and 200 age- and sex-matched controls are identified and a smoking history is obtained. Fifty of the lung-cancer cases and 20 of the controls are current smokers. Is it possible to estimate the difference in lung-cancer incidence between rent smokers vs. noncurrent smokers from these data? If so, estimate it and provide a 95% Cl. Is it possible to approximately estimate the RR between current smokers and noncurrent smokers for lung cancer from these data? If so, then estimate it and provide a 95% Cl.

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