Finding F critical for Variances
Use the F-distribution to find the degrees of freedon for the numerator (d.f.N.), the degrees of freedom for the Denominator (d.f.D.) and the critical F-value
Use the closest value when looking up the d.f.N. and d.f.D. in the tables.
Test |
alpha α |
Sample 1 | Sample 2 |
d.f.N. |
d.f.D. |
F critical |
Right | 0.01 |
s12=37 n1=14 |
s22=89 n2=25 |
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Two-tailed | 0.10 |
s12=164 n1=21 |
s22=53 n2=17 |
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Right | 0.05 |
s12=92.8 n1=11 |
s22=43.6 n2=11 |
TOPIC:Degrees of freedom and critical values for the F-test.
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