Mathematics · Psychometrics Statistics
During an item analysis of an educational assessment, the upper group and lower group each consist of 75 test-takers. For a specific item, 15 test-takers in the upper group answered correctly, whereas 45 test-takers in the lower group answered correctly. Calculate the Item Discrimination Index (D) for this item and identify what this value indicates.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1D = -0.60; The item is flawed because low-scoring individuals are more likely to answer it correctly.
- 2D = 0.40; The item effectively differentiates between high-scoring and low-scoring individuals.
- 3D = -0.40; The item is flawed because low-scoring individuals are more likely to answer it correctly.✓
- 4D = -0.20; The item is flawed because low-scoring individuals are more likely to answer it correctly.
Correct answer
D = -0.40; The item is flawed because low-scoring individuals are more likely to answer it correctly.
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