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 ...

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.

Degrees of freedom are commonly discussed in various forms of hypothesis testing in statistics, such as a chi-square ... the degree of freedom is zero. The formula to determine degrees of freedom ...

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