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As a distribution of scores gets flatter, what happens to the optimal boundary line for determining higher- and lower-scoring groups for item-discrimination indices? Group of
As a distribution of scores gets flatter, what happens to the optimal boundary line for determining higher- and lower-scoring groups for item-discrimination indices? Group of answer choices The optimal boundary line gets larger. The optimal boundary line gets smaller. The optimal boundary line ceases to be optimal. The optimal boundary line does not change
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