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Item Response Theory

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Multiple Choice

Which of the following is a key assumption of Item Response Theory?

  1. The probability of a person answering an item correctly is independent of the other items on the test.
  2. The probability of a person answering an item correctly is determined solely by their ability level.
  3. The probability of a person answering an item correctly is the same for all items on the test.
  4. The probability of a person answering an item correctly is determined by their ability level and the difficulty of the item.
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