Chi-Square Statistic

Definition

The chi-square statistic is a measure used in hypothesis testing to determine if there is a significant difference between observed and expected frequencies in categorical data. It quantifies how much the observed data deviates from what would be expected under the null hypothesis.

Related terms

Null Hypothesis: A statement that assumes no relationship or difference between variables.

P-value: The probability of obtaining results as extreme as, or more extreme than, the observed data assuming the null hypothesis is true.

Significance Level: The threshold used to determine whether to reject or fail to reject the null hypothesis.