Question: Why does one need at least three conditions for sphericity to be an issue? a. Because sphericity is always relevant when you're comparing two sets

Why does one need at least three conditions for sphericity to be an issue?

a. Because sphericity is always relevant when you're comparing two sets of difference scores.

b. Because sphericity is always relevant when you're comparing two related means.

c. Because sphericity is always relevant when you're comparing two unrelated means.

d.Because sphericity is always relevant when you're comparing one variance.

I know the answer is not B as "sphericity is not relevant if comparing only two means" according to my textbook.

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