Question: Suppose that observations are taken only at two values, x1 and x2, of an independent variable. Let y1 and y2 be the average observed responses

Suppose that observations are taken only at two values, x1 and x2, of an independent variable. Let y1 and y2 be the average observed responses for x = x1 and for x = x2, respectively. Show that the estimated regression line passes through points (x1, y1)

and (x2, y2).

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