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What does it mean if a test question is item-biased?
It means that the question favors people who live in a certain area, have had certain life experiences, speak a certain language, or other factor that is not part of what is being tested. An example would be a question on a grammar test that references something that only occurs in mountains, and the student has never visited the mountains, so can not understand what the question is asking, even though the student may know the grammar component.