For a given item, when the performances of those whose overall scores put them among the highest third of the group are compared with those who scored among the lowest third of the group, the resulting difference is called the
A) discrimination index (DI).
B) item difficulty level (IDL)
C) item response test (IRT)
D) discrimination of performance evaluation (DOPE)

Question

Quizplus · Accepted Answer

The difference in performance between those who score in the highest and lowest thirds of the group is a measure of an item's ability to discriminate between high- and low-performing individuals. This is calculated using the discrimination index (DI), making option A the correct answer. Option B, item difficulty level (IDL), refers to how easy or difficult an item is regardless of performance, while option C, item response test (IRT), is a method for analyzing responses to items on a test. Option D, discrimination of performance evaluation (DOPE), is not a commonly used term in educational measurement.

For a Given Item, When the Performances of Those Whose