Question: Answer.... D Let X = [x1, x2], b be a real number and B = (b1, b2) be a vector of R2. Consider the following

Answer....

D Let X = [x1, x2], b be a real number and B = (b1, b2) be a vector of R2. Consider the following regression model: (1) y = XB + LI (2) x2 = by +v where u and v are regression residuals.. Show that x2 is orthogonal to x1 if and only if b = 0

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