Bozeman Science
Chi-squared Test
Paul Andersen shows you how to calculate the ch-squared value to test your null hypothesis. He explains the importance of the critical value and defines the degrees of freedom. He also leaves you with a problem related to the animal...
Khan Academy
Khan Academy: Contingency Table Chi Square Test
A video about contingency Table Chi-Square Test.
Khan Academy
Khan Academy: Chi Square Distribution Introduction
An introduction to Chi-Square Distribution.