15. Using difference scores in a pretestposttest design does not partial out the effect of the pretest
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15. Using difference scores in a pretest–posttest design does not partial out the effect of the pretest for the following reason:
(a) The pretest scores are not normally correlated with the posttest scores
(b) The pretest scores are normally correlated with the difference scores
(c) The posttest scores are normally correlated with the difference scores
(d) None of the above
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Related Book For 
Statistics Without Maths For Psychology
ISBN: 9781292128856
7th Edition
Authors: Chistine Dancey, John Reidy
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