3.44 For testing : = with two binomial variates y and y2, a reasonable test...

3.44 For testing Ηο: πι = π₂ with two binomial variates y₁ and y2, a "reasonable" test would not reject Ho if y₁ = y2 = 0. Since as π₁ and π₂ approach 0, the probability of this converges to 1 even if π₁ ≠ π2, explain why any such test is biased, potentially having power less than its size (Haber 1986).