This edition: Chi-Square Tests
This lesson goes a step farther in what can be done with categorical data. Researchers often look at questions that have more than two categorical outcomes, or they may study more than two groups at a time. Categorical data often falls into multiple classes or outcomes. Researchers want to know how those classes or outcomes compare to each other as a whole. In addition, they want to know if the results of their comparison are statistically significant.
Making such inferences requires yet another type of statistical test, one that is introduced in this lesson and that has its own unique distribution. As you proceed through the lesson, you will see how this new test enables a successful company to properly track its inventory, and researchers to determine how the makeup of visitors to our national parks affects public policy.