Finding a Critical F-Value for a Two-Tailed Test In Exercises 9 –12, find the critical F-value for a two-tailed test using the level of significance α and degrees of freedom d.f.N and d.f.D.
α=0.01, d.f.N=6, d.f.D=7
α=0.10, d.f.N=24, d.f.D=28
α=0.05, d.f.N=60, d.f.D=40
α=0.05, d.f.N=27, d.f.D=19