In an experiment to test an aspect of cognition in chimpanzees, 67 chimpanzees were given two boxes to open. 17 of them succeeded in opening both boxes, 15 of them failed in opening both boxes, 24 of them opened the first box but not the second, and 12 of them opened the second box but not the first. Does this data support the idea that both boxes were equally difficult for the chimpanzees to open?
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