Wolfram Research
Wolfram Math World: Probability and Statistics
This is a resource for many topics in probability and statistics. Click on the topic of your choice for an explanation. The sites you will be linked to are quite extensive. A degree of higher-level math is necessary for understanding...
Science Education Resource Center at Carleton College
Serc: Nature of the Chi Square Distribution
Students learn that statistical distributions, such as the normal, Student's t, chi-square and F distributions are interrelated. They will explore these relationships and discover equivalent statistical tests that can used in specific...