Do It Yourself!: Exploring Correlation

Correlation and the Organization of the Scatterplot

Move the slider to change the organization of the points in the scatterplot. Notice how the correlation coefficient r changes.

Correlation and the Quadrants

The green lines separate the scatterplot below into four quadrants by dividing each variable at its mean. The correlation is largest when most of the points lie either in the first and third or the second and fourth quadrants.

Correlation and the Regression Line

The scatterplot below shows the best-fitting regression line. As the correlation increases, the points fall closer to the line.

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The applet(s) on this page is from Seeing Statistics,™ an online, interactive statistics textbook. Seeing Statistics is a registered service mark used herein under license. The applet(s) on this page was designed to be used exclusively with Introduction to Probability and Statistics, Eleventh Edition, by Mendenhall, Beaver, & Beaver. (c) 2003, Duxbury Thomson Learning. The applet(s) on this page may not be copied, duplicated, or reproduced for any reason.