In computing which of the following statistical tests are the degrees of freedom of the numerator and denominator used?

The F-test uses two separate degrees of freedom, one for the numerator and one for the denominator.

The F-statistic is a ratio of two variances (mean squares).

The numerator variance carries its own degrees of freedom.

The denominator variance carries a second degrees of freedom.

This pair (df1, df2) fixes the shape of the F distribution.