Statistics › Section M · The F distribution and ANOVA › Topic M.2

Facts about the F distribution

ANOVA's verdicts are read from the F distribution - a family of right-leaning curves built from ratios of variances. Meet the family before the two-variance test puts it to final use: two degrees of freedom, values near 1 when nothing is happening, and a long right tail when something is.

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In this topic

A distribution of ratios
Two parameters, always
Shape: leaning right from zero
The mean
Worked example: reading F against its centre
Where F appears
Worked example: one statistic, three curves
Common mistakes to avoid
Key takeaways

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