When performing an F-test, if the means differ significantly, the between-group variance will be much smaller than the within-group variance.

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If the means differ significantly, the between-group variance will be much larger than the within-group variance. This is because the F-test compares the variance between groups to the variance within groups, and if there is a significant difference in means, it implies that the between-group variance is greater.

When Performing an F-Test, If the Means Differ Significantly, the Between-Group