# Chi-square test statistic

- The chi-squared test statistic for a Single Population Variance is:

Where

Ï‡^{2 } = standardized chi-square variable

n = sample size

s^{2} = sample variance

Ïƒ^{2} = hypothesized variance

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- The chi-squared test statistic for a Single Population Variance is:

Where

Ï‡^{2 } = standardized chi-square variable

n = sample size

s^{2} = sample variance

Ïƒ^{2} = hypothesized variance

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