When you establish that assumption of sphericity has been violated, what should you do next?
A) Use one of the non-parametric tests to apply the appropriate correction.
B) Collect more data to reduce the random variance in the dataset.
C) You can continue your analysis. SPSS offers you a correction that you can use in this situation. You can use several t tests comparing individual means.
D) You can continue your analysis. SPSS offers you a correction that you can use in this situation. Greenhouse-Geisser correction is the one that is most frequently used.

Question

Quizplus · Accepted Answer

When the assumption of sphericity is violated in statistical analysis, one common approach is to apply a correction to adjust the degrees of freedom for the F-tests. The Greenhouse-Geisser correction is a widely used method for this purpose, and it is available in statistical software like SPSS. This correction helps to control for the increased Type I error rate that occurs when sphericity is not met.

When You Establish That Assumption of Sphericity Has Been Violated