- The definition of chi-square is a results statistics test used to show if unproven results are as expected or unusual.
An example of chi-square is using a table to show whether or not a six sided die will land on the three side once out of every six times it is rolled.

## chi-square

noun

a statistical method used to test whether the classification of data can be ascribed to chance or to some underlying law

## chi-square

noun

A test statistic that is calculated as the sum of the squares of observed values minus expected values divided by the expected values.