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Let X and Y be two random variables such that Y has the binomial distribution Bi(π, N) and, given Y = y, X has the binomial distribution Bi(p, y).
(a) Suppose that p ∈ (0, 1) and π ∈ (0, 1) are unknown and N is known. Show that (X, Y) is minimal sufficient for (p, π).
(b) Suppose that π and N are known and p ∈ (0, 1) is unknown. Show whether X is sufficient for p and whether Y is sufficient for p.
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