Question: 12.88 [This exercise requires the material in the chapter appendix.] Suppose that the regression model y = b0 + b1x1 + b2x2 + e is

12.88 [This exercise requires the material in the chapter appendix.]

Suppose that the regression model y = b0 + b1x1 + b2x2 + e is estimated by least squares. Show that the residuals, ei, from the fitted model sum to 0.

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