Application Guide

You can unlock the intercept by choosing Unlock Movable Line Intercept on the
Analyze menu.
Tracing a Movable Line
You can trace a movable line to predict and analyze values.
1. Click the line.
The pointer changes.
2. From the Analyze menu, click Graph Trace to enable Trace mode for the line.
Rotation of the line is not supported in Trace mode.
3. Press ◄or► (left or right arrow keys) to trace the movable line.
If the plotted variables change, points on the graph and the line are updated
automatically.
Showing a Line of Regression
You can show a line of regression when you have a scatter plot or an X-Y line plot on
the work area. Studying the line of regression can help you understand the relationship
between two variables.
1. With a scatter plot or X-Y line plot of two variables on the work area, click the
Analyze menu, choose Regression and view the list of regressions.
2. Click the type of regression line to show. For example, choose Show Linear (mx+b)
to plot a linear regression line as shown in the following example.
When the line of regression is selected, the expression for the line displays.
Data&Statistics Application 377