Frequently Asked Questions
What is the F statistic?
F = s₁² / s₂², the ratio of two sample variances. Tests whether the underlying population variances differ.
When should I use this?
Before pooled t-tests to check equal-variance assumption, or to formally compare spread between two groups.
Is the F-test robust?
No - it assumes normal data. For robust comparisons use Levene's or Brown-Forsythe test.
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