.
Press 
to draw a historogram. The bar widths are determined
by the xScl range variable. All y values must be integers.
to select Scatter
which draws the individual points on the graph.
to select xy line
which connects points with a line in the order they occur in the list.
to select Draw Regression
which graphs the current regression equation.
to select Clear Drawing
which clears the screen of everything but the selected functions.
hides the menu.