What is meant by sphericity in the context of a repeated measures one-way ANOVA?
a. If you compute differences between all pairs of experimental groups, the variances of those differences should be approximately equal.
b. If you compute the means of all experimental groups, the standard error of those means should not be exactly the same.
c. If you compute differences between all pairs of experimental groups, the variances of those differences should not be approximately equal.
d. If you compute the means of all experimental groups, the standard error of those means should be approximately the same.
Answer: a. If you compute differences between all pairs of experimental groups, the variances of those differences should be approximately equal.
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