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A researcher is interested in the effects of sleep deprivation and caffeine intake on mood. Participants were randomly assigned to a sleep condition (normal or
A researcher is interested in the effects of sleep deprivation and caffeine intake on mood. Participants were randomly assigned to a sleep condition (normal or deprived) and a caffeine condition (zero cups, two cups, or four cups). After the manipulations, mood was measured (such that higher numbers indicated better mood). The results were as follows:
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