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Education QUESTION #6764
Question 1
According to Item Response Theory (IRT), an item characteristic curve (ICC) that is very steep (high slope) in the middle of the ability scale is said to have high discrimination. What does this graphically mean for test construction?
  • Students of all ability levels have an equal probability of answering correctly
  • A small difference in ability around the item's difficulty threshold produces a large change in the probability of a correct response, making the item highly efficient at separating examinees near that ability level✔️
  • The item is very difficult because only high-ability students can answer it
  • The guessing parameter (G) for this item is necessarily low
Correct Answer Explanation
The slope of the ICC reflects discrimination power. A steep slope means: for examinees near the item's difficulty level, even a slight difference in underlying ability dramatically changes the probability of success. This is a highly efficient discriminating item. Flatness means all ability levels have similar success rates — poor discrimination. Steepness does not dictate difficulty; an item can be steep at any point on the ability scale.