Thirty men in college were taught a method of finger tapping. They were randomly assigned to three groups of ten, with each receiving one of three doses of caffeine: 0 mg, 100 mg, 200 mg. This is approximately the amount in no, one, or two cups of coffee. Two hours after ingesting the caffeine, the men had the rate of finger tapping per minute recorded. The experiment was double blind, so neither the recorders nor the students knew which group they were in. Does caffeine affect the rate of tapping, and if so how?

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0 mg 100 mg 200 mg 0 mg 100 mg 200 mg 242 248 246 245 246 248 244 245 250 248 247 252 247 248 248 248 250 250 242 247 246 244 246 248 246 243 245 242 244 250