Many studies have been conducted to test the effects of marijuana use on mental abilities. In one such study, groups of light and heavy users of marijuana in colleges were tested for memory recall, with the results given below. Use a 0.01 significance level to test the claim that the population of heavy marijuana users has a lower mean than the light users. Should marijuana use be of concern to college students? Light marijuana users: n = 64, x = 53.3, s = 3.6 Heavy marijuana users: n = 65, x = 51.3, s = 4.5

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