Suppose that a sequence of mutually independent and identically distributed discrete random variables X₁, X₂, X₁... X, has the following probability density function f(x: 0) = d) x! 0, for x = 0,1,2,... elsewhere What is the Cramer-Rao lower bound for the variance of the unbiased estimator of the parameter 6? e) Use the one-parameter regular exponential family definition to find the functions, h(x),c(0),w(0) and t(x).

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