Question

In a study examining the effects 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 30 minutes after participants consumed one 6-ounce glass of wine. Again, they used a standardized simulation task for which the regular population averages of population = 4000 msec. The distributions of reaction times are approximately normal with variance = 40. Assume that the researchers obtained a sample mean of M = 422 for the n = 25 participants in the study. A) Are the data sufficient to conclude that alcohol has a significant effect on reaction time? Use a two-tailed test with a = 0.01. B) Do the data provide evidence that alcohol significantly increased reaction time? C) Compare Cohen's d to estimate the size of the effect.

          In a study examining the effects 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 30 minutes after participants consumed one 6-ounce glass of wine. Again, they used a standardized simulation task for which the regular population averages of population = 4000 msec. The distributions of reaction times are approximately normal with variance = 40. Assume that the researchers obtained a sample mean of M = 422 for the n = 25 participants in the study.

A) Are the data sufficient to conclude that alcohol has a significant effect on reaction time? Use a two-tailed test with a = 0.01.
B) Do the data provide evidence that alcohol significantly increased reaction time?
C) Compare Cohen's d to estimate the size of the effect.

Added by Amparo R.

Question

Please give Ace some feedback