4. (6 points; 3/3) Imagine you were interested in the effects of secondhand smoke on lung cancer for non-smokers, and were given the following information in the table. a. What would be the relative risk of getting lung cancer, conditional on having significant exposure to secondhand smoke for non-smokers? b. Clearly explain how one would collect data to study the impact of secondhand smoke on lung cancer, and the advantages of using an analysis with relative risk ratios