Originally Posted by

**brett701** All my life i seem to interpret formulas incorrect. ive never really tried in school until now. ive been in college for awhile. i know im pathedic. Anyways, i have a relatively simple question. Forgive me because i dont know how to superscribe and XXXX i cant think of the terms. anyways. im donig hte least squares regression line.

E=sum in my equation.

S_x_y=E X_i Y_i

why do i multiply X*Y individually and then sum that entire row?

Why dont i multiply the sum of the X's times the sum of the Y's?