The Chi-Square (χ2) test for categorical variables determines whether there is a difference in the population proportions between two or more groups.
- H0: π1 = π2 = π3 (there is no difference between the three portions)
- H1: π1 ≠ π2 ≠ π3 (there is a difference between the three portions)
Example: You might use the Chi-Square test to compare the proportion of patients that vomited in the PACU between patients that received ondansetron, patients that received droperidol, and patients that received a placebo.
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