Question: In a study of the effects of the use of marijuana on college students, groups of light and heavy users of marijuana were tested from memory recall by sorting items. The results were

Light n = 57, \(\bar{X}\) = 54.3, s = 2.9

Heavy n = 68, \(\bar{X}\) = 49.3, s = 5.4

Test the hypothesis at the \(\alpha \) = 0.01 level that the mean recall score for heavy marijuana users is lower than the mean recall score for light marijuana users.

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