Question

An experiment was conducted to test the effects of alcohol. The errors were recorded in a test of visual and motor skills for a treatment group of people who drank ethanol and another group given a placebo. The results are shown in the accompanying table (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). Use a 0.05 significance level to test the claim that the treatment group has scores that vary more than the scores of the placebo group. $$\begin{array}{c|c} \begin{array}{c} \text { Treatment } \\ \text { Group } \end{array} & \begin{array}{c} \text { Placebo } \\ \text { Group } \end{array} \\ \hline n_{1}=22 & n_{2}=22 \\ \bar{x}_{1}=4.20 & \bar{x}_{2}=1.71 \\ s_{1}=2.20 & s_{2}=0.72 \end{array}$$

          An experiment was conducted to test the effects of alcohol. The errors were recorded in a test of visual and motor skills for a treatment group of people who drank ethanol and another group given a placebo. The results are shown in the accompanying table (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). Use a 0.05 significance level to test the claim that the treatment group has scores that vary more than the scores of the placebo group.
$$\begin{array}{c|c}
\begin{array}{c}
\text { Treatment } \\
\text { Group }
\end{array} & \begin{array}{c}
\text { Placebo } \\
\text { Group }
\end{array} \\
\hline n_{1}=22 & n_{2}=22 \\
\bar{x}_{1}=4.20 & \bar{x}_{2}=1.71 \\
s_{1}=2.20 & s_{2}=0.72
\end{array}$$

Added by Juan Manuel N.

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