Chi-square Test – Test for value of a single population variance

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The tests concerning the value of a population variance of a normally distributed population are called Chi-square tests.

For this test, we calculate a Chi-square distributed test statistic. A chi-square distribution is an asymmetrical distribution. Its shape approaches a normal distribution as the degrees of freedom increases. A chi-square distribution has a lower bound of 0. So, it does not have negative values.