Show Regression Line
The Show Regression Line option is only applicable for Scatter plots, and can be used to toggle on or off the display of the best fit linear regression line for a Scatter plot.
Note that the correlation coefficient, and y-intercept and slope (alpha and beta) for the best fit linear regression line, are always listed at the bottom of a Scatter plot, even if the regression line is not displayed.
The Show Regression Line option is available in the right-click menu, and the Chart menu.