The critical value for a right-tailed $F$ test is $2.57$ when $\alpha = 0.025$, the degrees of freedom for the numerator are 15 , and the degrees of freedom for the denominator are 20 .

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The critical value for an $F$ test depends on the significance level ($\alpha$), the degrees of freedom for the numerator, and the degrees of freedom for the denominator. However, without specific tables or a calculator for the $F$-distribution, the exact value cannot be confirmed as correct for the given parameters. Critical values vary widely across different combinations of degrees of freedom and significance levels.

The Critical Value for a Right-Tailed FFF Test Is 2.572.572.57 When α=0.025\alpha = 0.025α=0.025

The Critical Value for a Right-Tailed $F$ Test Is $2.57$ When $\alpha = 0.025$