This paper discusses programs that clarify some statistical ideas often discussed yet poorly understood by students. The programs adopt the approach of demonstrating what is happening, rather than using the computer to do the work for the students (and hide the understanding). The programs demonstrate normal probability plots, overfitting of models and generalized linear models. Although the implementation is in Matlab, any suitable language is appropriate. (Contains 7 figures.) [Reprinted from "Journal of Computers in Mathematics and Science Teaching" 22(3) because some characters in equations were inadvertently omitted.]