How does caffeine consumption impact attention span? Researchers know that the average number of facts a person can remember (when given brand new information) is 7 with a standard deviation of 2. I have 24 participants come in to try to memorize a list of facts after drinking two cans of Mountain Dew (high caffeine) The group is able to memorize an average of 8 facts. Does caffeine impact memory? Which test (inferential) statistic is most appropriate to answer this research