In some regression situations, there are a priori reasons for assuming that the xy -relationship being approximated passes through the origin. If so, the equation to be fit to the ( x i , y i ) ’s has...

In some regression situations, there area priorireasons for assuming that thexy-relationship being approximated passes through the origin. If so, the equation to be fit to the (x_i

,
y_i

)’s has the formy=bx. Use the least squares criterion to show that the “best” slope in that case is given by