In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. upon ascertainment of all lung cancer deaths, the investigator obtained the following data:

# of individuals lung cancer deaths
smokers 24,500 15
non-smokers 10,500 2
4) calculate the proper measure of association of smoking and lung cancer death. interpret your results.

5) calculate the population risk difference. interpret your results. ( 4 points)

6) calculate the population etiologic fraction for smoking and lung cancer based on these data. interpret your results. ( 4 points)