General Studies · Psychological Testing
The Item Discrimination Index in test construction is primarily based on:
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- 1The passing percentage of respondents on an item from the lower group only
- 2The passing percentage of respondents on an item from the upper group only
- 3The difference in passing percentages between the upper criterion group and lower criterion group for an item✓
- 4The overall difficulty level of all test items combined
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The difference in passing percentages between the upper criterion group and lower criterion group for an item
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