How do you calculate linear regression on on the ti-84 calculator?

First, put the data into lists 1 and 2. (Get to the lists by pressing Stat and then Edit.) Then press Stat, choose Calc at the top, and choose LinReg(ax+b). Press ENTER and it will display the regression equation, giving the values for a and b.

(If you want r and r2 values but don't see them, press 2ND Catalog (above zero) and choose DiagnosticOn. Press ENTER and then calculate the liner regression again.)

If you data is in lists other that 1 and 2, you can specify that by doing something like this:

LinReg(ax+b) L3, L4