An item-discrimination index typically compares
A) high scorers' performances with low scorers' performances on a particular item.
B) medium scorers' performances with low and high scorers' performances on a particular item.
C) low scorers' performances with lower scorers' performances on a particular item.
D) one group of scorers' performances on the item with any other groups of scorers' performances on the same item.

Question

Quizplus · Accepted Answer

An item-discrimination index typically compares high scorers' performances with low scorers' performances on a particular item. This is done to determine if the item is effective at distinguishing between stronger and weaker performers.

An Item-Discrimination Index Typically Compares