Let X₁X and Y₁Ym follow the location model X₁ = 0₁ + Zi, i = 1,...,n Y₁ = 0₂ + Zn+i; i = 1, ..., m, where Z₁,..., Zn+m are iid random variables with common pdf f(z). Assume that E(Z) = 0 and Var(Z₁) = 03 < 0. Show that E(X) = 0₁, E(Y₂) = 02, and Var(X₁) = Var(Y) = 03.

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