A shameless plug here: bookmark this site. See the Google custom search bar at the top of the page? Type in a topic (like “How to find the interquartile range“) and it will take you to one of several hundred easy how-to articles on just about every elementary stats topic you can think of. Leave a comment for when you get really stuck! You should also check out our Practically Cheating Statistics Handbook, which covers all of the basic topics you’ll need to pass your class (including a TI83/TI89 calculator how-to!).