Four 2 × 2 tables, numbered 1€“4, are shown below. For each one the response is Yes/No and the explanatory variable is A/B.

a. Which two tables have the same pair of conditional proportions?
b. For which table(s) is the difference (A versus B) in conditional proportions the largest?
c. For which table(s) is the difference (A versus B) in conditional proportions the smallest?

1 A B Yes 10 20 | 3 B A 2 A B Yes 10 10 4 A B Yes 20 10 No 20 10 Yes 20 10 No 20 20 No 10 20 No 10 20