An experiment was conducted to test the effects of alcohol. The breath alcohol levels were measured for a treatment group of people who drank ethanol and another group given a placebo. The results are given in the accompanying table. Use a 0.05 significance level to test the claim that the two groups come from populations with the same mean.

Based on data from "Effects of Alcohol Intoxication on Risk Taking, Strategy, and Error Rate in Visuomotor Performance," by Streufert et al., Journal of Applied Psychology, Vol. 77, No. 4.

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Treatment Group m, = 22 x, = 0.049 s, = 0.015 Placebo Group ":=22 x, = 0.000 s, = 0.000