Use the fact that EsXijd 5 m 1 ai 1 bj withoai 5 obj 5 0
Chapter 11, Problem 14(choose chapter or problem)
Use the fact that EsXijd 5 m 1 ai 1 bj withoai 5 obj 5 0 to show that EsXi? 2 X??d 5 ai, so thatai 5 Xi? 2 X?? is an unbiased estimator for ai.
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