Plotting the Correlation Correlation

Another way to illustrate the relationship between a scatterplot and a correlation is shown in the following applet named. This applet allows you to move a slider to vary the correlation coefficient, and then see associated changes in the scatterplot. There are two scatterplots shown, one with the regression line (to be discussed in Chapter 10) superimposed. The line often makes it easier to see the relationship between the variables, especially for low correlation. An example of the output of the applet follows.

• Practice moving the slider to vary the correlation coefficient. The click on the button labeled “Switch Sign” to see the same degree of correlation in a negative relationship.

Comments to: Gary.McClelland@Colorado.edu

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