For which type of variables is the Chi-Square test best suited?

The Chi-Square test is most appropriately applied to categorical variables. This statistical test is designed to assess whether there is a significant association between two categorical variables, or to compare observed frequencies in various categories with expected frequencies.

Categorical variables represent distinct groups or categories without any inherent numerical value or order, such as gender, race, or the presence/absence of a condition. The Chi-Square test evaluates how the distribution of sample categorical data compares to an expected distribution.

While other types of variables may have their own statistical tests (such as t-tests for continuous variables), the Chi-Square test specifically leverages the categorical nature of its data to draw meaningful conclusions about relationships and associations between different groups.