In item analysis, what does an Item Difficulty Index (P-value) of 0.85 indicate about a test question?
Answer and explanation
Correct answer: B. The item was very easy
- Step 1: The difficulty index (P) is the proportion of total test-takers who answered the item correctly: P = R / T. Step 2. A P-value of 0.85 means 85% answered correctly, classifying it as an easy item. Answer: The item was very easy. Why not the others: A difficult item has a low P-value (e.g. 0.20); discrimination is a separate index (D); difficulty does not determine cognitive level.
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