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    Calculating model (Analytically)

    Hi, can anyone help me out with this question? Assume that the true data generating process (the true model) is: y = 20 −30(x + r) + 4w + ê. Suppose that we also know that E(ê|x) = E(ê|w) = E(ê|r) = 0, Cov(x, w) = 20, Cov(x, r) = Cov(w, r) = 0, Var(x) = 10, Var(w) = 8 and Var(r) = 6. What...