CK-12 Foundation
Ck 12: Statistics: Test of Independence
[Free Registration/Login may be required to access all resource tools.] This Concept covers the chi-square test of independence and the homogeneity test.
Rice University
Hyper Stat Online Statistics Textbook: Contingency Table
A brief explanation and example of what a statistical contingency table is.
Other
An Introduction to 2 Way Tables
Site has an example problem worked through showing how a two-way table is constructed, read, and used. Discussion then continues with a handful of learning exercises for the user to practice.
Rice University
Hyper Stat Online Statistics Textbook: Computing the Chi Square Test
Using an example, the site walks the user through the steps needed to compute the Chi-Square Test of Independence. Links are provided along the way for relevant materials.