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to es. 9.2 Let Y1, Y2, .. . . Y, denote a random sample from a population with mean / and variance o Consider the
to es. 9.2 Let Y1, Y2, .. . . Y, denote a random sample from a population with mean / and variance o Consider the following three estimators for ! PL = =(Y, + YZ). A3 = Y. 2 (n 2) 4 a Show that each of the three estimators is unbiased. b Find the efficiency of us relative to 2 and , respectively
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