What is the importance of item difficulty and how is it calculated?
What will be an ideal response?
• It is important for there to be variability in individuals’ test scores. Items that everyone gets “right” or everyone gets “wrong” provide no basis for comparison and yield similar test scores for all test takers. Therefore, developers analyze each test item for its difficulty.
• We define item difficulty as the percentage of test takers who respond correctly.
• We calculate each item’s difficulty or p value (percentage value) by dividing the number of persons who answered correctly by the total number of persons who responded to the question.
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a. amphetamine c. nicotine b. caffeine d. benzodiazepine
Brooks has schizophrenia. It would be expected that his hippocampus would be
A. smaller than normal. B. larger than normal. C. unusually disorganized. D. displaced within the brain compared to someone without schizophrenia
Sound waves can be "seen" by using an _______
a. oscilloscope b. electromagnetic spectrum c. audio amplifier d. amp meter
Under certain conditions, people will choose the cooperative option when playing the "prisoner's dilemma" game. For example, when a player ________, that player will be more likely to play cooperatively
a. expects to interact with his or her partner in the future b. resolves the public good dilemma c. punishes his or her partner after a competitive response d. begins competitively and switches to cooperative responses