"janne" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> How do I do the first (X-X(with a line above))? I have tried to take > _ > X-X *snip* > 0 > As you see the answer is zero. What do I do wrong? You calculate SUM[(x-x_bar)] * SUM[(y-y_bar)] instead of what you are asked for, which is SUM[(x-x_bar)*(y-y_bar)]. In other words, multiply each "x" term by the corresponding "y" term BEFORE you perform the sum. ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at http://jse.stat.ncsu.edu/ =================================================================