PSYB07H3 Final: EXAM REVIEW CHI SQUARE
Document Summary
Example 1: classifying yourself as studious or not. Example 2 (one variable): choice of psya01 sections. If you don"t square it, it will end up being zero. We may expect different categories to have the same frequency if chance alone is at work. 9 df = k-1 = 4-1 = 3 the # of conditions that you have. Go to t table and look up 2(3) = 7. 82 at = 0. 05. 7. 82 on the 2 table is the same as 1. 96 on the z table but 7. 82 is corrected for degrees of freedom. Therefore, 2 must be > critical number to reject null hypothesis (cid:229) Contingency table contingency is another word for possibility. Must first determine the expected frequencies of the four observed frequencies (the four bolded cells) Testing the null hypothesis that the variables are independent. We know the probability of the joint occurrence of two independent events is the product of their separate of their separate probabilities.
