A follow-up Tukey HSD is not necessary for main effects when the F value is based on degrees of freedom.
A) 1, 20
B) 2, 20
C) 4, 20
D) 4, 10.

Name: A follow-up Tukey HSD is not necessary for main effects when the F value is based on degrees of freedom. A) 1, 20 B) 2, 20 C) 4, 20 D) 4, 10.
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When the F value is based on degrees of freedom 1, 20, it indicates there are only two groups being compared, so a Tukey HSD test is not necessary as it is used for multiple comparisons.

A Follow-Up Tukey HSD Is Not Necessary for Main Effects