If the assumption of constant correlations in a repeated-measures ANOVA is violated, which of the following is true?
A) The F-value is incorrect.
B) The degrees of freedom should be adjusted.
C) The sample cannot be valid.
D) The manipulation checks failed.

Question

Quizplus · Accepted Answer

When the assumption of sphericity (constant correlations) is violated in a repeated-measures ANOVA, the degrees of freedom should be adjusted using corrections like Greenhouse-Geisser or Huynh-Feldt to maintain the validity of the test.

If the Assumption of Constant Correlations in a Repeated-Measures ANOVA