CHI-SQUARE AND VARIANCE TESTS
Testing categorical data for variation
Tests discussed in preceding chapters have sometimes required you to assume that a population has a specific probability distribution, such as the normal or binomial distribution. This chapter introduces the chi-square distribution, a technique to test these assumptions. This chapter also explores the chi-square distribution as a means of performing one- and two-population hypothesis testing.
The goodness-of-fit test determines whether a population follows a particular distribution. The chi-square test for independence will tell you if two categorical variables are related. This chapter also includes two types of variance tests: a single population test that uses ...