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Dr. Wong wants to know if retention changes over the lifespan. He creates a computerized retention test and gives it to a group of 20-year-olds, 40-year-olds, 60-year-olds, and 80-year-olds. Because the 80-year-olds did so poorly on this test (compared to the other groups), he assumed that retention of material (i.e., short term memory) decreases over the lifespan. What is the MAIN problem with Dr. Wong’s study?
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