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Chapter 15: Chi-Square Tests
CHAPTER 15
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Chi-Square Tests
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You should study the topics in this chapter if you need to review
or want to learn about
Properties of the chi-square distribution
The chi-square test for goodness-of-fit
The chi-square test for independence
Benford’s Law
15 - 1 Introduction
Here we will study a special probability distribution called the chi-square
(
) distribution. We will discuss the properties of the distribution and use
it to test for goodness-of-fit and independence. As with the
-distribution,
this chi-square distribution will depend on its degrees of freedom
.
Figure
15-1
shows examples or a family of this distribution with varying degrees of
freedom.