Question: 2. Consider the SLR model Y, = Bo + BiXi + zi. For these questions, you may take as known anything we proved in lecture

2. Consider the SLR model Y, = Bo + BiXi + zi. For these questions, you may take as known anything we proved in lecture about the ki, if you wish. (a) (2 points) Show that EXje; = 0 Solution: EXje; = E(X; - X)e; = E(Xi - X)(Yi - bo - biXi) = E(Xi - X) (Y, - Y) - boE(X; - X) - biSSx = SSXY - 85. SEXY SS. = 0

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