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 (xi, yi)€™s has the form y = bx. Use the least squares criterion to show that the €œbest€ slope in that case is given by

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Λ. Σν X;yi i=l b=- η Σή i=1