Interactive Applets – Correlation
In order to get a better sense for how the value of r relates to the strength of the linear relationship, take a look at this applet from the Rosman/Chance collection which asks you to guess the value of the correlation for a random dataset. Click on New Sample to generate another dataset.
Here is another interactive demonstration from the Rosman/Chance collection which has extensive options and illustrates many ideas about linear regression and correlation.
And, remember the two-variable calculator we introduced earlier.
This document is linked from Linear Relationships – Correlation.