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Does marijuana use make you slow? A random selection of 28 heavy marijuana users spent an average of 38.28 minutes to complete a set of logic puzzles. Their standard deviation was 4.51 minutes. A random selection of 29 non users spent an average of 25.4 minutes to complete the same set of logic puzzles. Their standard deviation was 3.98 minutes. Use a 0.01 significance level to test the claim that the population of heavy marijuana users takes longer on average to complete the set of problems than non users (Do not assume equal variances).