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## F-value

**The F-values are at the bottom line of the probability density function of the F-distribution.**

**The F-value and the F-distribution**

Four distributions are very commonly used in statistics: the normal distribution, the t distribution, the chi-squared distribution and the F distribution. Depending on the test, a z, a t, a chi-square or an F is calculated.

The calculated F-value is compared with the critical F-value of the F-distribution. If the calculated value exceeds the critical value, the result is called statistically significant.

The critical F values can be found in tables. Because the F-test has two degrees of freedom, one for the numerator and one for the denominator, these tables are fairly extensive. The critical F-values can be found in any good statistical textbook or can be downloaded from our site.