m .n 4 (2 points) An epidemiologist has found secondhand smoke exposure has a signicant statistical association with upper respiratory infections (URI). Using the information on association, we can infer that second hand smoke is a cause of URI. 0 a) True O b) False Question 5 (2 points) How did John Snow translate epidemiologic observation to public policy? O a) Observed disease transfer from patient to patient by physicians and medical students who did not wash their hands between treating patients O b) Observed that improvement of social conditions had an inverse association with the incidence of infectious diseases 0 c) Observed deaths from cholera and correlated them with water supply companies develop smallpox V Question 6 (2 points) Select two (2) primary modes of disease transmission