The index of item difficulty can vary from
A) 0 to 100
B) -1.0 to +1.0
C) 0.0 to +1.0
D) 0.5 to +1.0

Name: The index of item difficulty can vary from A) 0 to 100 B) -1.0 to +1.0 C) 0.0 to +1.0 D) 0.5 to +1.0
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Question

Quizplus · Accepted Answer

The index of item difficulty typically ranges from 0.0 to +1.0, where 0 indicates that no one answered the item correctly (most difficult) and 1 indicates that everyone answered the item correctly (least difficult).

The Index of Item Difficulty Can Vary from