There are two types of main problem you’ll encounter with the F-Distribution you might be asked to find the area under a F curve given numerator degrees of freedom (ndf), denominator degrees of freedom (ddf), and a certain range (for example, P( 1 ≤ X ≤ 2 ), or you might be asked to find the F value with area to the left, a certain ndf and ddf (useful for finding critical values for hypotheses tests).
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A Statistical F-Test can be used to compare two variances, s1 and s2, by dividing them. The result is always a positive number (because variances are always positive).
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