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ULLL Dsu i8 an unbiased estimate of Umin 4. The random variables X1, X2, . . . .xn have a common nonzero mean μ, a common variance σ2, and the correlation between any pair of random variables is ρ. (a) Find var (b) If and hence prove that-1/(n-1) バ1. 71 仁1 is an unbiased estimate of σ2, find a and b. Hence show that, i this case,
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