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Tool: Dynamic Correlation
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Description: This applet is simple to use but can provide students with real insight into how to read scatterplots and into how correlation coefficients can be misleading. Once the applet is first loaded, click the reset button to display the axes, place the cursor in the array area, and click the left mouse button to add points to the scatterplot. Points can be dragged and dropped by putting the cursor directly over the point, depressing and holding the left mouse button, and moving the point to its new location. As points are added, the slope, intercept, and correlation values appear in the lower right corner. These values are updated as points are added or moved. A confidence band can also be set (in standard deviation units) to provide a visual indication of outlying points in the scatterplot.
Technology Type: Java Applet 
Author: Mike Pilant and Bob Hall
Language: English 
Cost: Does not require payment for use

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Courses: Probability & Statistics Correlation