Question: 3.19. (Sec. 3.4) Prove (l/N)L~_l(Xa - .... )(Xa - .... )' is an unbiased estimator of I when .... is known.

3.19. (Sec. 3.4) Prove (l/N)L~_l(Xa - .... )(Xa - .... )' is an unbiased estimator of I when .... is known.

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