In a study with more than two levels of the independent variable, comparisons of pairs of means that are planned before the study is performed are called:

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Planned comparisons of pairs of means before the study is performed are called a priori tests. Post hoc tests are conducted after the study is completed to compare all possible pairs of means. F tests are used to test the overall significance of the differences between groups in an ANOVA. Pretests are used to measure baseline levels before an intervention is administered.

In a Study with More Than Two Levels of the Independent