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 college were tested for memory recall (based on data from "The Residual Cognitive Effects of Heavy Marijuana Use in College Students" Journal of the AM Med Assoc). 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 Heavy Marijuana Users n1 = 64 n2 = 65 1 - 53.5 $2 - 51.3 S = 3.1 5=3.3 Write the alternative hypothesis [ Select ] What is the test statistic? [ Select ] Calculate the p-value [ Select ] Make a statement about the hypothesis. [ Select ]