Olson's Science

The folks at the National Center for Education Statistics (NCES) are a branch of the Federal Government here in the US responsible for collecting and analyzing data related to education.  If you ever want to see things on "The Condition of Education in the US" or some such, these are the folks whose web site you should first go to.  One of the nice things they happened to do is a quick tutorial on how to do Graphing.  You should already be familiar with these ideas, but it is always good to have a handy refresher available.