Question: 2.34 When X and Y are conditionally dependent at each level of Z yet marginally inde- pendent, Z is called a suppressor variable. Specify joint

2.34 When X and Y are conditionally dependent at each level of Z yet marginally inde-

pendent, Z is called a suppressor variable. Specify joint probabilities for a 2 x 2x2 table to show that this can happen

(a) when there is homogeneous association, and

(b) when the association has opposite direction in the partial tables.

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