Chi-Square Calculator

    Calculate chi-square test statistic

    Formula

    χ² = Σ(O-E)²/E

    Chi-square tests if observed frequencies differ from expected.

    Examples

    O: 30,20 vs E: 25,25

    χ² = 2.0, not significant at α=0.05.

    Frequently Asked Questions

    About Chi-Square

    Calculate chi-square test statistic for goodness of fit.