tracksofakillermoveableline

=media type="custom" key="1620807"Fitting a Moveable Line= Please recall that our goal is to predict a person's stride length from his or her height in order to use the clues left at the scene of the crime to help catch the killer. Do the points in our scatterplot appear to follow a linear pattern?

1. Slect the graph by clicking on it once. This activates the **Graph** menu. (If the **Graph** menu does not appear, make sure that your graph is selected.) Choose **Moveable Line** from the **Graph** menu. The line that appears in the graph is //not// a fixed line. You can change its slope and intercept by dragging it. Dragging on the //end// of the line causes it to //rotate// around the other end. Dragging the //middle// of the line //moves it parallel// to itself. The cursor changes shape to suggest what will happen when you drag. Notice that the equation of the line shown below the graph updates as you drag.

2. Experiment with dragging the line. Position it so that it appears to give a good fit to the data. 3. Save your work. Your tasks for the day are completed.

Return to Tracks of a Killer. Continue to Day Three Activities.