Test of Fisher

Test of Fisher or equality of two Variance S

To test the equality of two variances one uses the test of Fisher, by submitting the report/ratio of the two variances and by checking that this report/ratio does not exceed a certain theoretical value which one seeks in the table of Fisher .

F = S ² has/S ² B

note: one places at the numerator largest of the two variances.

If F is larger than the theoretical value, the assumption of equality of the two variances is rejected.

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