In a study examining the effect of alcohol on reaction time, Liguori and Robinson (2001) found...

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 the

u = 400 msec. The distribution of reaction times is approximately normal with o = 40.

Assume that the researcher obtained a sample mean of M = 422 for the n = 25 participants in the study.

a. Are the data sufficient to conclude that the alcohol has a significant effect on reaction time?

Use a two-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 = .05.

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

Solutions

Expert Solution

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orchestra answered 2 years ago

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