The F-Ratio Distribution

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If and
are chi-squared random variables with
and
degrees of freedom, then the ratio
follows the F-ratio (or F-distribution) with parameters
and
The F-distribution arises in statistical comparisons of the variability in two populations.
Contributed by: Chris Boucher (March 2011)
Open content licensed under CC BY-NC-SA
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"The F-Ratio Distribution"
http://demonstrations.wolfram.com/TheFRatioDistribution/
Wolfram Demonstrations Project
Published: March 7 2011