Let X1,.. Xn (n>3) be a r.s. from a population having a Poisson distribution with parameter...

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Let X1,.. Xn (n>3) be a r.s. from a population having a Poisson distribution with parameter A. In order to estimate the parameter A, we consider the two estimators: X + X, + 3x +...... +X. , then %3D n+2 If we know that the Cramer-Rao lower bound for a regular and unbiased estimator of A isL, is any of the aforementioned estimators an efficient one? Select one: a. only A, b. both of them C. only A d. non of them efficient Let X1,.. Xn (n>3) be a r.s. from a population having a Poisson distribution with parameter A. In order to estimate the parameter A, we consider the two estimators: X + X, + 3x +...... +X. , then %3D n+2 If we know that the Cramer-Rao lower bound for a regular and unbiased estimator of A isL, is any of the aforementioned estimators an efficient one? Select one: a. only A, b. both of them C. only A d. non of them efficient