Find the differential of the function. 
Definitions:
Variability
A statistical measure that indicates the extent to which data points in a dataset differ from the average value.
F-ratio
The ratio of variance between groups to the variance within groups in an ANOVA test, used to determine if there are any significant differences between group means.
Denominator
The bottom part of a fraction that indicates into how many parts the whole is divided.
Numerator
The top number in a fraction that shows how many parts of a whole are being considered or used.
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