Question

Let X_1, X_2,...,X_n be iid observations from σ2 (μ, ) , \sigma ^{2}>0 is known and \mu is an unknown real number. Let g(t) = 211 be the parameter of interest.

(a) Find the CRLB for the variance of an unbiased estimator for g( \mu ).

(b) Find the UMVUE for g( \mu ).

(c) Show that T(X_1,...,X_n) =X_{1}^{2} + 2X_{3} - X_{4}^{2} is an unbiased estimator for g( \mu ).

(d) Show that E(T|\bar{X}) = 2\bar{X} .


σ2 (μ, )


g(t) = 211




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