The quadratic regression option finds the equation of a quadratic equation of the form

y = ax

Press and use to select CALC.

Press and .

Therefore, the best-fit quadratic equation for this data is approximately y = 3.09x

Press to view the regression equation and press . The equation is now entered in . Press . The data points can also be viewed. Access STAT PLOTS by pressing to turn the plots on. Press .

The TI-83 does not calculate the correlation coefficient r but does
calculate the coefficient of determination r^{2}. The value of
.995 indicates a very good fit.