The difference between the percentage of examinees in the upper group who answer an item correctly and the percentage of examinees in the lower group who answer the item correctly is called the ____________ index.
A)internal consistency
B)item difficulty
C)item reliability
D)item discrimination

Question

Quizplus · Accepted Answer

The difference between the percentage of examinees in the upper group who answer an item correctly and the percentage of examinees in the lower group who answer the item correctly is called the item discrimination index. This index measures how well an item can distinguish between high-performing and low-performing examinees.

The Difference Between the Percentage of Examinees in the Upper