Texas Instruments TINSPIRE Teacher Software Guidebook - Page 640

Showing a residual plot You can show a residual plot to determine how well a line fits data. The work area must include a scatter plot and one or more movable lines, regressions, or plotted functions for Show Residual Plot to be available. ` With a scatter plot, line of regression, and/or movable line in the work area, select the Analyze menu, and select Show Residual Plot > Residuals. Notes: • With multiple regressions or functions and movable lines plotted, you can select each by clicking the line to show its residual plot. • Click and hold a dot on the residual plot to see the residual. • The residual plot for the selected regression or function displays in the work area. • For consistency in comparing sets of data, residual plots do not rescale when you move from one function or regression to another. • Select a function or regression before a showing residual plot. If no function or regression is selected and there are several plotted, Data & Statistics arbitrarily selects the function or regression for showing the residual plot. • Axes can be adjusted by clicking and dragging. Removing a residual plot ` With a scatter plot, line of regression, and/or movable line in the work area, select the Analyze menu, and select Hide Residual Plot. Using Window/Zoom tools Use the Window/Zoom tools to redefine the graph to better view points of interest. The Window/Zoom tools include: 628 Using Data & Statistics