What is Sphericity?
A. A form of compound symmetry, which assumes that the variances of the difference between data taken from the same participant being tested are equal.
B. A form of compound symmetry, which does not assume that the variances of the difference between data taken from the same participant being tested are equal.
C. A form of parallel symmetry, which assumes that the errors of the difference between data taken from the same participant being tested are equal.
D. A form of compound symmetry, which assumes that the errors of the difference between data taken from the same participant being tested are unequal.
Answer: A
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