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0. Four arbitrary points (x1, y1), (x2, y2), (x3, y3),(x4, y4) are given in the x, y-plane. Using the method of least squares, if regressing y upon x gives the fitted line y = ax + b; and regressing y upon x gives the fitted line y + ax + b; and regressing x upon y gives the fitted linex = cy + d, then
Two fitted lines must coincide
Two fitted lines need not coincide
It is possible that ac = 0
A must be 1/c
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