5. Let X1，X2，..... Xn be a random sample from the normal distribution N(θ,1).
(b) If Var. Does the variance of attain the Cramer- Rao lower bound for estimating θ2? Give your reason. (10%)
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. Does the variance of
attain the Cramer- Rao lower bound for estimating θ2? Give your reason. (10%)