Reconsider the previous exercise.
a. Calculate the relative risk of being a smoker, comparing those who never attend church to those who attend church at least once per week. Also write a sentence interpreting what this calculation reveals.
b. Repeat (a) for the other three categories of church attendance, comparing each to the €œat least once a week€ category.

Data from previous exercise

A Gallup poll conducted in 2013 examined whether there is an association between church attendance and smoking status among American adults. The following table reports the percentage of people who classify themselves as smokers, conditional on self-described level of church attendance.

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Almost every week Never At least once per week About once a month Seldom 12% 14% 22% 25% 30%