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In assessment, when items correctly distinguish between high and low performers, the measure is called discrimination index — a high discrimination means the item is _______.

A) poor
B) ambiguous
C) good
D) irrelevant

Correct Answer: C) good

An item's discrimination index shows how well it differentiates between students who know the material (high performers) and those who do not (low performers). A high positive index means the item is good at this separation.

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