Correlation by eye
The applet below allows one to guess the sample correlation, r,
for a data set. When the applet loads, a data set consisting of 20
points is displayed. Points can be added to the plot by clicking the
mouse. Points on the plot can be removed by clicking on the point and
then dragging the point into the trash can. All of the points on the
plot can be removed by simply clicking inside the trash can. Enter
your guess for r in the Guess field, and then click the
Show r! button to see if you are within 0.1 of the true value.
Click the New data button to generate a new data set.