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F Distribution
 

The F distribution is a continuous probability distribution. The F Distribution is formed from the ratios of two chi-squared variables. If X1 and X2 are independent chi-square variables then:

F statistic

The pdf is:

F Function pdf

Very few people can calculate f(x) using mental arithmetic.

F distribution

The F Distribution is used test hypothesis that involve variances, in for example ANOVA.

 

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