In item analysis, what does a negative Discrimination Index (D < 0) for a test question indicate?
Answer and explanation
Correct answer: D. More students from the lower-scoring group answered the item correctly than students from the upper-scoring group
- Step 1: Discrimination index measures the difference in success rate between high-achievers and low-achievers: D = Pu - Pl. Step 2. A negative value (D < 0) means struggling students outperformed top students on that question, signaling ambiguity or miskeying. Answer: More students from the lower-scoring group answered the item correctly than students from the upper-scoring group. Why not the others: Negative discrimination indicates flawed items; perfect items have positive discrimination (D > 0.30).
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