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Finding F critical for Variances Use the F-distribution to find the degrees of freedon for the...

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
Two-tailed 0.10

s12=164

n1=21

s22=53

n2=17
Right 0.05

s12=92.8

n1=11

s22=43.6

n2=11
Math   Statistics-And-Probability   
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TOPIC:Degrees of freedom and critical values for the F-test.

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