Objective
Introduction
Plotting
Prediction
Examples
Exercises
The regression line can be used to predict the value of y for a given value of x. Predictions should be made within the range of the x values and (generally) should not be made beyond this range, i.e., the regression equation should not be extrapolated (extended) beyond the range of the x values.
In the above applet, select Regression from the Model menu and then select 95% confidence limits from the Options menu. Drag the vertical line, representing a 95% confidence interval on the mean, to get predicted y values for a range of x values.
Exercise #1 requires you to model the linear relationship between long jump distance and Olympic year.