A researcher analyzes her data using a one-way ANOVA. When would she use post-hoc comparisons?
A) The F value is significant and there are more than two groups being compared
B) The F value is significant and there are two groups being compared
C) The F value is nonsignificant and there are 3 or more groups being compared
D) a and b

Question

Quizplus · Accepted Answer

Post-hoc comparisons are used when the F value is significant and there are more than two groups being compared. This is because the ANOVA only gives information about whether there is a significant difference among the groups as a whole, but does not indicate which specific groups differ from one another. Post-hoc tests can be used to determine which groups differ significantly from each other.

A Researcher Analyzes Her Data Using a One-Way ANOVA