All F-tests for the equality of two population variances are one-tailed tests.

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F-tests for the equality of two population variances are two-tailed tests. This is because the null hypothesis states that the variances are equal, and the alternative hypothesis states that they are not equal, which could mean one is greater or one is smaller. Therefore, the F-test looks for differences in variance in either direction, making it a two-tailed test.

All F-Tests for the Equality of Two Population Variances Are