Quadratic Regression

The quadratic regression option finds the equation of the form y = ax2 + bx + c that best fits a set of data. First, enter the data.

The data shown here is the points {(2,11.4), (3,17), (5,27.3), (7,36.1), (11,47.7), (13,49.9)}.

Press to view the statistics calculation options.

Press for regressions, then to select quadratic.

Therefore, the best-fit quadratic equation for this data is approximately y = -0.23x2 + 7.13x - 2.11.

Note: The resulting quadratic equation is an exact fit if three noncollinear data points are entered. The correlation coefficient r is not calculated.

If an error message occurs, make sure the data was entered correctly or press to view the setup.

Use , , and the menu keys to select List1 for 2Var XList, List2 for 2Var YList, and 1 for 2Var Freq.