Which of the following statements is not correct?
A) Sphericity can be calculated when an independent variable has two conditions.
B) The assumption of sphericity looks at the variability in the difference scores between conditions.
C) The Mauchly's test of sphericity is used to test the assumption of sphericity.
D) The assumption of sphericity tells if the experimental manipulation has a consistent effect on the differences between conditions.

Question

Quizplus · Accepted Answer

Sphericity relates to designs with more than two conditions. It assumes that the variances of the differences between all combinations of related groups are equal. When there are only two conditions, this assumption is not applicable because there is only one possible difference, making the concept of sphericity irrelevant.

Which of the Following Statements Is Not Correct