χ2 Test for Independence

Definition

The χ2 test for independence is a statistical test used to determine if there is an association between two categorical variables. It assesses whether the observed frequencies differ significantly from what would be expected if the variables were independent.

Related terms

Contingency Table: A contingency table is used to display the frequencies or counts of two categorical variables in order to analyze relationships between them.

Degrees of Freedom: In statistics, degrees of freedom refer to the number of values that are free to vary when estimating certain parameters. It plays a role in determining critical values for hypothesis testing.

Null Hypothesis (H0): The null hypothesis states that there is no association between two categorical variables being tested with the χ2 test for independence.