a. (2) Generate two tables: one for smokers and another for nonsmokers.

b. (2) What is the odds ratio for developing stenosis for males relative to females (smokers only)?

c. (2) What is the Mantel-Haenszel combined odds ratio for males developing stenosis relative to females, combining both smokers and nonsmokers?

d. (2) Perform a logistic regression with stenosis as the outcome and sex and smoking status as the explanatory variables. What is the equation?