14. In a study examining the effect of alcohol on reaction time, Liguori and Robinson (2001) found that even moderate alcohol consumption significantly slowed response time to an emergency situation in a driving simulation.  In a similar study, researchers measured reaction time 30 minutes after participants consumed one 6-ounce glass of wine.  Again, they used a standardized driving simulation task for which the regular population averages u = 400 msec.  The distribution of reaction times is approximately normal with o = 40. Assume that the researchers obtained a sample mean of M = 422 for the n = 25 participant in the study. 

A. Are the data sufficient to conclude that alcohol has a significant effect on reaction time? Use a one-tailed test with a = .01.

b.  Do the data provide evidence that the alcohol significantly increased (slowed) reaction time? Use a one-tailed test with a = .01.

c. Compute Cohen's d to estimate the size of the effect.

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