While viewing a data set from the data editor, press to access the zoom menu. Press to access 9:ZoomStat. The window is automatically adjusted to the data.
Note If the plot shows the graph of an unwanted function, go to the equation editor (Y=) and deselect the unwanted function by placing the cursor over the highlighted = for that function, then press . Press the thumb pad down arrow and notice that the = is no longer highlighted. Press to view the new graph without the unwanted function.