Scatter Plot Calculator

Paste a list of x values and a list of y values and this draws them, rather than only describing them. You get the scatter plot with the least squares line through it, a second plot of the residuals against x, and a table giving the fitted value and the residual for every point. The usual numbers are there too: slope, intercept, correlation, r squared and the standard error of the estimate. The picture is the point, because curved data and a single far-out point both give a respectable r squared and both look wrong the moment they are plotted.