Professor Plum created class intervals from the test scores for his class. He made a line graph using these intervals on the X-axis and the proportion of students who answered a particular question correctly on the Y-axis. The result is
A)a discrimination index.
B)a correlation index.
C)an item characteristic curve.
D)a histogram.

Question

Quizplus · Accepted Answer

An item characteristic curve (ICC) plots the probability of answering a question correctly (on the Y-axis) against the ability level of the test takers (often represented by their test scores or class intervals on the X-axis). This is used in item response theory to analyze the properties of test items, including how well they discriminate between different levels of test-taker ability.

Professor Plum Created Class Intervals from the Test Scores for His