Other
Stat Soft: Getting Started With Statistics Concepts
Definitions of the basic concepts in statistics. Great for review and discussion or for introduction into topics.
University of Georgia
University of Georgia: Definitions in Statistics
This site contains definitions to use in statistics and ways to collect data.
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...
Other
Stat Soft: Statistics Glossary
Dozens of statistical terms are defined and illustrated in this glossary.
Shodor Education Foundation
Shodor Interactivate: Stats and Probability Concepts
Many topics on Statistics and Probability are defined and linked here. Click on any of them to move to a more detailed discussion of the term.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Stats & Probability Lesson Plans
A collection of elementary lesson plans for the beginning study of statistics. These plans, written by educators, detail the materials needed for the instructional activity and the steps to be followed.