National Council of Teachers of Mathematics
The Math Forum: Nctm: Ask Dr. Math: Correlation of a Scatterplot
This page from Ask Dr. Math describes the correlation of a scatterplot and gives an example of one with no correlation.
California State University
Cal State San Bernardino: Bivariate Distribution Applet
The applet is a target at which green darts are shot either with a strict correlation to each other or without -- the user defines this. A good example of how bivariate data is truly influenced by two variables, possibly dependent upon...
Khan Academy
Khan Academy: Eyeballing the Line of Best Fit
Students practice informally graphing a line of best fit to a scatter plot and answer questions to determine if a scatter plot has a correlation. Students receive immediate feedback and have the opportunity to watch a video, get hints,...
Khan Academy
Khan Academy: Describing Scatterplots (Form, Direction, Strength, Outliers)
Description and example of a scatter plot.