Tuesday, September 13, 2011

Practice with Correlation Coefficients

Today in class we practiced matching scatterplots with correlation coefficients using this online game. The applet generates random correlation coefficients and accompanying scatterplots and keeps track of your success in matching them.

Give it a try tonight if you're still feeling shaky about scatterplots and correlation coefficients. To give yourself even more practice, see if you can come up with an example of two variables that might be related in the manner described by the correlation coefficients generated for you.

Here's one last test. What does the scatterplot to the left suggest about the relationship between arm strength and grip strength?

Can you take a guess as to what correlation coefficient might describe the relationship depicted on the scatterplot?

(The answer? r =.686. Were you close?)

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