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The decision to use either the Kuder-Richardson 20 (KR 20) or the Kuder-Richardson 21 (KR 21) is based on whether:A : the method used to determine reliability is the test-retest or the alternate form method.B : correlation or regression is going to be used.C : the items measure a homogeneous or heterogeneous behavior domain.D : the item format is multiple-choice or true-false.
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