Question: Pn i=1 ei = 0 (b) If you plug X (the sample mean) into the estimated regression line, the resulting estimate for Y will be

Pn i=1 ei = 0 (b) If you plug X (the sample mean) into the estimated regression line, the resulting estimate for Y will be Y (the sample mean). (c) Using the equation ei = Yi Y i , find E{ei}. (d) Show that Pn i=1 Yi = Pn i=1 Y

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