Previous lecture dealt with direct p-value calculation for contingency tables. This one shows how conventional Chi Square Tests are used for this purpose. Also the Bayesian methodology for testing equality of means in a Beta-Binomial Model is introduced. The two topics are linked.
Khan Academy Lecture on Chi-Squares - Supplementary Material on use of Chi-Square Test in Contingency Tables 17 min
Econometric L6 covers association, correlation, contingency - More elementary presentation of basic concepts involved
BE L11: Chi-Square in Contingency Tables - Class lecture also covers some Bayesian estimation and Credible Intervals for Beta=Binomial and relation to Chi=square