With your mouse, drag data points and their error bars, and watch the best-fit polynomial curve update instantly. You choose the type of fit: linear, quadratic, cubic, or quartic. The reduced chi-square statistic shows you when the fit is good. Or you can try to find the best fit by manually adjusting fit parameters.

This activity is designed to support student learning of solving equations through error analysis.  Studnets will descibe in typed words the error and correct the error to solve the equation properly.