Suppose that Y₁, Y₂,..., Y, is a random sample from a probability density function in the (one-parameter) exponential family so that [a(0)b(y)e-le®)d(y)], a ≤ y ≤ b, f(y10) = 0, elsewhere, where a and b do not depend on 9. Show that Σd(Y) is sufficient for 0.

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