The Line of Fit element shows a linear regression line with confidence intervals for the fit.
Figure 2.27 Line of Fit Options
Tip: If you have multiple graphs, you can color or size each graph by different variables. Drag a second variable to the Color or Size zone, and drop it in a corner. In the Variables option, select the specific color or size variable to apply to each graph.

Help created on 7/12/2018