Paige McLaughlin / Investopedia A chi-square (χ 2) statistic is a test ... students select among the offered classes using the formula given above and a χ 2 statistical table.

What is the chi ... formula, the ∑ symbol denotes taking the sum of (adding together) the succeeding quantities over all four cells in the contingency table. For our example: This gives us a test ...

A chi-square (also called chi-squared) test is a classical statistics technique that can be used to determine if observed-count data matches expected-count data. A chi-square (also called chi-squared) ...

A statistical test that allows one to determine whether observed quantities of a specific characteristic differed from the expected value purely by chance.