-Aaron is studying smoking behavior and has coded "smoker" as "1" and "nonsmoker" as "0." The predictor is the number of family members who smoke. Which of the following is a correct interpretation of an odds ratio of +2?
A) For every additional family member who smokes, the odds of being a smoker increase by 100%.
B) For every additional family member who smokes, the odds of being a smoker decrease by 100%.
C) For every one-unit increase in being a smoker, the odds of having a family member who smoke increase by 100%.
D) For every one-unit increase in being a smoker, the odds of having a family member who smoke decrease by 100%.

Question

-Aaron is studying smoking behavior and has coded "smoker" as "1" and "nonsmoker" as "0." The predictor is the number of family members who smoke. Which of the following is a correct interpretation of an odds ratio of +2?
A) For every additional family member who smokes, the odds of being a smoker increase by 100%. 
B) For every additional family member who smokes, the odds of being a smoker decrease by 100%. 
C) For every one-unit increase in being a smoker, the odds of having a family member who smoke increase by 100%. 
D) For every one-unit increase in being a smoker, the odds of having a family member who smoke decrease by 100%.

Quizplus · Accepted Answer

(The number of family members who smoke is the independent variable. The positive sign of the odds ratio indicates that the odds of being a smoker increase as the independent variable increases in value.)
In the smoking study, Aaron has obtained the following classification table.

-Aaron Is Studying Smoking Behavior and Has Coded "Smoker" as "1