Which of the following regarding the assumption of sphericity is false?
A. When sphericity is violated, we need to adjust the degrees of freedom for any F-ratios affected by the violation.
B. The effect of violating sphericity is a loss of power (i.e., an increased probability of a Type II error).
C. Sphericity does not affect post hoc tests.
D. When sphericity is violated, the Bonferroni post hoc test can be used.
Answer: C
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