Chapter 17
Looking for Links in Categorical Data: Two-Way Tables
IN THIS CHAPTER
Reading and interpreting two-way tables
Finding joint, marginal, and conditional probabilities
Checking the independence of two categorical variables
In this chapter, you practice breaking down and analyzing the data presented in two-way tables. Two-way tables appear when two categorical variables are measured and you want to look at the relationship between the two variables. For example, how do males and females differ in terms of whom they voted for in the last presidential election?
You use appropriate probability notation to denote probabilities for two-way tables by applying letters to describe the groups comprising the categorical variables you want the probabilities for. For example, if set A stands for the group of females, 
(the complement of set A, or everything that isn’t in set A) stands for the group of males. Set B may represent people who vote for the incumbent president, and 
represents ...
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