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Item Difficulty Index (P) is calculated as the proportion of students who answered the item:

A) Incorrectly
B) Correctly
C) Did not attempt
D) Guessed the answer

Correct Answer: B) Correctly

A high P-value (e.g., 0.90) means the item is easy; a low P-value (e.g., 0.20) means the item is difficult.

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