The F-test used for testing the difference in 2 population variances is always a one-tailed test.

Name: The F-test used for testing the difference in 2 population variances is always a one-tailed test.
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The F-test used for testing the difference in 2 population variances is a two-tailed test. This is because the null hypothesis is that the two population variances are equal, and the alternative hypothesis is that they are not equal (either one is larger or one is smaller).

The F-Test Used for Testing the Difference in 2 Population