When You Establish That Assumption of Sphericity Has Been Violated

Multiple Choice

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.