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Question
Which is true regarding the item characteristic curve, or "S" curve, in Item Response Theory (IRT)?a. It assumes that as people's abilities increase, their probability of answering the item correctly decreases.
b. A tall "S" means that an item has difficulty discriminating across ability.
c. IRT and the S curve assist in writing items to target specific ranges of ability.
d. It is useful in predicting the Standard Error of the Estimate.
Answer
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