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Chi-Square Statistic

Chi-Square Statistic


This lesson will explain the chi-square statistic.

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Terms to Know
Chi-Square Statistic

The sum of the ratios of the squared differences between the expected and observed counts to the expected counts.

Expected Counts

The frequencies we would have expected within each of the categories in a qualitative distribution if the null hypothesis were true.

Observed Counts

The frequencies within each of the categories in a qualitative distribution.

Formulas to Know
Chi-Square Statistic

capital chi squared space equals space sum from blank to blank of fraction numerator left parenthesis O space minus space E right parenthesis squared over denominator E end fraction