This interactivity will allow you to add points to and delete points from a scatter plot to determine the effect on the correlation coefficient and the least-squares line. You will be able to see the original plot and a “what if”, alternate scenario plot side-by-side.
Instructions
- Enter values for the scatter plot below.
- Click "Plot" to view the scatter plot, with super-imposed least-squares line, on both graphs. The correlation coefficient and the equation of the least-squares line will be displayed at top of the graph.
- The original graph is outlined in green.
- Clicking on a point within the alternate graph (outlined in blue) will remove the point and update the least-squares line accordingly.
- Clicking on white space within an alternate graph will add a point and update the correlation coefficient and least-squares line accordingly.
- To restore and plot the default values, click "Restore Default".
©2004 McGraw-Hill Higher Education
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