This site gives a definition and an example of scatterplots. Topics include positive and negative association.

This applet lets you study the relationship between pairs of variables using scatterplots, the correlation coefficient, the graph of averages, linear regression, and residual plots. You can select...

This site gives detailed instructions for calculating the median-median line. The median-median line is an alternative to the least squares regression line that is less sensitive to outliers.

As described on the page itself: "The simulation shows a scatterplot of data from a bivariate distribution in which the relationship between the two variables is linear. You can change the "input"...

In this demonstration a scatterplot is displayed and you draw in a regression line by hand. You can then compare your line to the best least squares fit. You can also try to guess the value of...

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