Suppose that for a question, 15% of people selected response "a", 20% selected response "b", 30% selected response "c" (which is the correct response), and 35% selected response "d". Which item analysis data do you have for that item?
A) item difficulty analysis data
B) item discrimination analysis data
C) item distractor analysis data
D) both a and c

Question

Quizplus · Accepted Answer

The percentages of people selecting each response option provide item difficulty analysis data, as they show how many test-takers answered the item correctly (30% for "c") and how difficult the item was based on that. It also provides item distractor analysis data, as it shows how the incorrect options ("a", "b", and "d") attracted test-takers, indicating the effectiveness of the distractors.

Suppose That for a Question, 15% of People Selected Response