StatBasics
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Teaching program

Adjustable correlation plot

Without using any maths at all, the idea of a correlation coefficient to describe the degree of relationship between variables is introduced in an intuitive way as early as screen 4. The demonstration here runs automatically but in the CD program, the student can manipulate the slider to change the closeness of the relationship.

By moving the slider, the student simultaneously controls the degree of association displayed in the scatter plot and the numerical correlation coefficent, r, describing that degree of relationship. This makes it possible, without performing any calculations, to get an intuitive grasp of what a correlation coefficient tells you about association between variables.