A negative item-discrimination index results for a particular item when
A) more high scorers than low scorers on a test get the item correct.
B) more low scorers than high scorers on a test get the item correct.
C) an item is found to be biased and unfair.
D) most testtakers do not enter the response keyed correct for the particular item.

Question

Quizplus · Accepted Answer

The item-discrimination index is calculated by comparing the performance of high scorers with low scorers on a particular test item. If more low scorers get the answer correct and more high scorers get it wrong, it indicates that the item is not discriminating well between high and low scorers, resulting in a negative item-discrimination index.

A Negative Item-Discrimination Index Results for a Particular Item When