An experiment was conducted to test the effects of alcohol. Researchers measured the breath alcohol levels for a treatment group of people who drank ethanol and another group given a placebo. The results are given below. Use a 0.05 significance level to test the claim that the two sample groups come from populations with the same mean. The given results are based on data from €œEffects 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: Placebo Group: ni=22, x-0.049, s1=0.015 n,-22, x2=0.000, s2=0.000