Scholastic
Scholastic: Max's Math Adventures: A Hairy Situation
Help Max make a bar graph to show the hair colors of his classmates. Teachers will appreciate the activities with bar graphs in the extra challenges. Use the teacher's guide to create a fun and engaging lesson.
The Math League
The Math League: Using Data and Statistics: Pie Charts
This introductory tutorial about statistical graphing with four examples of how pie charts (circle graphs) are constructed and read.
Other
Nmu: Box and Whisker Plot Instructions
Site discusses the use of box-and-whisker plots. An example is presented and completely worked through, so that the user can see the results of the calculations after the steps have been explained.