AS/A2 Stats 2 Stats 3

S1 Topic 4: Correlation and regression
Fit a line by eye
You can estimate the regression line and to guess the value of Pearson's correlation. Indicate your estimate of the regression line by drawing a line on the scatterplot. When you release the mouse button, the mean square error (MSE which is the average squared deviation of points from the line) is displayed. You can draw another line and see if you can lower the MSE. To see the best fitting line, select the Draw regression line option. To see the MSE for the best fitting line, select the Show minimum MSE option. Five possible values of Pearson's correlation are listed. One of them is the correlation for the data displayed in the scatterplot. Guess which one it is. To see the correct value, click on the Show r button.

an applet from the Rice Virtual Lab in Statistics