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Chapter9Intro - STAT 200 Chapter 9 Two-Way Tables We will...

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STAT 200 - Chapter 9 - Two-Way Tables We will introduce chapter 9 here, and come back to it again towards the end of the course, once we have discussed inference. In these notes, we will talk about summarizing the relationship between 2 categorical/qualitative variables. In the next chapter (chapter 2), we will talk about examining the relationship between 2 continuous/quantitative variables. To examine the relationship between 2 categorical variables, we start by making a two-way table (sometimes called a contingency table). A two-way table is useful for describing the relationship between two categorical variables. A two-way table shows the marginal distribution for each variable, as well as the joint distribution of the 2 variables at the same time and also the conditional distribution of one variable, conditioned on a category of the other variable. Exercise : How is smoking related to alcohol use? (have data for 65 individuals or cases ).
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