What is the computed number for how well an item distinguishes between the "knowing" and the "unknowing"?
A) item analysis
B) discrimination index
C) difficulty index
D) attitude index

Question

Quizplus · Accepted Answer

The discrimination index is the computed number for how well an item distinguishes between the "knowing" and the "unknowing". It measures the extent to which students who score high on a test also answer a particular item correctly, and students who score low on a test also answer the item incorrectly. A high discrimination index indicates that the item is a good discriminator of student performance and measures a skill or concept that distinguishes between students who have mastered the material and those who have not.

What Is the Computed Number for How Well an Item