sleep researcher hypothesizes that people who are allowed to sleep for only four hours will score significantly lower than people who are allowed to sleep for eight hours on a cognitive skills test. In an experiment, he brought 14 participants into his sleep lab and randomly assigned them to one of two groups. In one group, participants slept for eight hours and in the other group, participants slept for four hours. The next morning he administered the CAT (Cognitive Ability Test) to all participants.

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