What is the formula you type in your calculator to find residuals?

Answer 1

First, store the x-values to L1 and the y-values to L2.

Go to the statistics menu by pressing [STAT], go to the calc menu, and choose a regression. Let's try linear. Select LinReg(ax+b)

That is now on the home screen. Put L1,L2 after that, so the home screen looks like:

LinReg(ax+b) L1,L2

press [ENTER]

now press [2nd][LIST], which is the second function of the stat button.

Scroll down, there will be the text RESID somewhere on the list. Press enter when you have found it. That is a list containing the residuals, and you can use it just like you use L1 and L2, though it changes whenever you do regressions, so you might want to store it to L3.