An F-test ( Snedecor and Cochran, 1983) is used to test if the standard deviations of two populations are equal. This test can be a two-tailed test or a one-tailed test.
Snedecor's F distribution is most commonly used in tests of variance (e.g., ANOVA). The ratio of two chi-squares divided by their respective degrees of freedom is said to follow an F distribution.
Also known as the Fisher-Snedecor distribution.
Rationale of the F distribution
Given two samples drawn from two independent normal distributions, the question is : ...
 See also: Distribution, Distribution function, Significance level, T test, Standard Deviation
  
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