In a dual-task methodology performance on a primary task is used to infer the processing resources used to perform a secondary task.
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fMRI is an example of a physiological dependent variable.
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In measuring learning and memory, percent savings is sometimes used to show how much savings there has been from having learned a task previously. Percent savings is an example of a composite dependent variable.
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In the Wechsler Adult Intelligence Scale a verbal subscale score and a performance subscale are combined into an IQ score. The IQ score can then be considered a multiple dependent variable.
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If we wanted to measure children's aggressiveness and found a high correlation between parent's ratings and teacher's ratings, we could say that these measures have high concurrent validity.
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A test's validity is high if giving the same test a second time results in similar scores.
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If a test were divided up so that the odd items were given to one group and the even items to a second group, and then the results were compared test-retest reliability could be determined.
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The reliability of a test has to do with whether it measures what it claims to measure.
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An operational definition of aggression in children could be whether they chose to play with guns, tanks, and knives or dolls, trucks, and tractors.
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A pilot experiment can be done after the main experiment is over to clear up any unanswered questions.
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