It's an IRT tool that is useful in helping test users to better understand the range over theta that an item is most useful for.It's called
A) an item response curve.
B) an information function.
C) an item trace line.
D) None of these

Question

Quizplus · Accepted Answer

An information function is a tool used in item response theory (IRT) to help understand the range over theta that an item is most useful for. It shows the amount of information that an item provides at various levels of the latent trait being measured (theta). This information can be useful in assessing the quality of an item and making decisions about item selection for a test. Item response curves and item trace lines are related to IRT, but they do not specifically address the range over theta where an item is most useful.

It's an IRT Tool That Is Useful in Helping Test