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An item has a difficulty value of 85%. A novice test developer describes it as “very difficult” because the numerical value is high. What conceptual error has been made?

A. Confusing difficulty percentage with discrimination power
B. Ignoring that a higher difficulty percentage means more students answered correctly
C. Treating reliability as a measure of difficulty
D. Confusing criterion-referenced and norm-referenced interpretation
Correct Answer: B. Ignoring that a higher difficulty percentage means more students answered correctly

A difficulty value of 85% means most students answered correctly, so the item is easy, not very difficult.

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