= 0.10, d.f. N = 20, d.f. D = 15 In this section, you only needed to calculate the right-tailed critical F-value for a two-tailed

α = 0.10, d.f._N = 20, d.f._D = 15

In this section, you only needed to calculate the right-tailed critical F-value for a two-tailed test. For other applications of the F-distribution, you will need to calculate the left-tailed critical F-value. To calculate the left-tailed critical F-value, do the following.

(1) Interchange the values for d.f._N and d.f._D.

(2) Find the corresponding F-value in Table 7.

(3) Calculate the reciprocal of the F-value to obtain the left-tailed critical F-value.

Find the right- and left-tailed critical F-values for a two-tailed test using the level of significance α and degrees of freedom d.f._N and d.f._D.