Lesson 11: Chi-Square Tests

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In this lesson we will learn how to compare the proportions of more than two independent groups and how to test for a relationship between two categorical variables. In this lesson you will also review risk and learn about relative risk.

Lesson 11 Learning Objectives

Upon completion of this lesson, you should be able to:

  • identify research questions that may be addressed using a chi-square goodness-of-fit test or chi-square test of independence.
  • conduct a chi-square goodness-of-fit test.
  • conduct a chi-square test of independence.
  • calculate and interpret relative risk.

Before we begin, let's review the various classifications of variables from Lesson 1:

      Categorical: Names or labels without a meaningful order of magnitudes, also known as qualitative

      Quantitative: Numerical values with magnitudes that can be placed in a meaningful order, also known as numerical

In this lesson we will be examining methods for analyzing categorical variables.