Mathematics · Psychometrics Statistics
A psychological test is administered to a total of 500 test-takers. To evaluate a specific item, a psychometrician isolates the top 27% and bottom 27% of the test-scorers (135 test-takers in each group). If 100 test-takers in the upper group answered the item correctly and 46 test-takers in the lower group answered it correctly, what is the Item Discrimination Index (D) for this item?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 10.11
- 20.20
- 30.40✓
- 40.25
Correct answer
0.40
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