The test statistic used to test hypotheses about the population variance is given by χ² = (n − 1)s² / σ²,which is chi-squared distributed with n − 1 degrees of freedom when the population random variable is normally distributed with variance equal to σ².

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This is a correct statement about the test statistic used to test hypotheses about the population variance. The test statistic, denoted by χ², follows a chi-squared distribution with (n-1) degrees of freedom, where n is the sample size, when the population random variable is normally distributed with variance equal to σ².

The Test Statistic Used to Test Hypotheses About the Population