Question: 14.4.3 Suppose that observations are taken only at two values, X I and X Z , of an independent variable. Let B1 and ?jzb e

14.4.3 Suppose that observations are taken only at two values, X I and X Z , of an independent variable. Let B1 and ?jzb e the average observed responses for x = X I and for z = 5 2 , respectively. Show that the estimated regression line passes through points (z1,Bi) and ( x 2 , i J 2 ) .

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