How to deal with data range

[HannanKan]

When it comes to draw picture, what interval is suitable? Can I just draw the part whose start point is the minimum data and end point is the maximum data?

[ichn-hu]

You actually have a lot of freedom to plot it, as long as your result looks good. As I have provided a solution in the handout (here), you can just draw them within the range plus an enlarged margin.