In a study of smoking and coronary heart disease (CHD), investigators classified participants into 4 different categories based on their level of smoking: 1) non-smokers 2) low: 1-4 cigarettes per day; 3) moderate: 5-15 cigarettes per day; 4) high: > 15 cigarettes per day. The results of their study are presented in the table below. Using the non-smoking group as the reference category, calculate the relative risk of CHD for: a) low-level smokers; b) moderate-level smokers; c) high-level smoker groups. Round your answers to 1 decimal place. CHD No CHD High (>15 cigarettes/day) 45 4,955 Moderate (5-15 cigarettes/day) 32 4,968 Low (1-4 cigarettes/day) 15 4,985 Non-smokers 10 4,990 Question 5 options: Blank # 1 Blank # 2 Blank # 3