What is item response theory?
A. a part of classical test theory that specifies that item difficulty and discrimination are related
B. a theory that relates the performance of each item to a statistical estimate of the test taker’s ability on the construct being measured
C. a theory that describes the cognitive steps a respondent takes before answering an item
D. a theory that uses probability to estimate the test taker's honestly or motivation when answering an item
Ans: B
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a. shortening b. lengthening c. shortening and then lengthening d. randomly varying the period
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