A random sample X1, X2, ... , Xn of size n is taken from N( , 2),

A random sample X1, X2, ... , Xn of size n is taken from N( μ, σ2), where the variance θ = σ2 is such that 0

and that this estimator is an unbiased estimator of θ.

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6- (1/1) ΣΗ (X-2 (X;