Mathematics · Psychometrics and Statistics
A test developer administers a new multiple-choice item to a sample of 450 test-takers during the pilot testing phase. Upon evaluating the responses, it is found that 279 test-takers answered the item correctly. Calculate the Item Difficulty Index (p-value) for this test item.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 10.38
- 20.42
- 30.55
- 40.62✓
Correct answer
0.62
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