15. The researchers cited in the previous problem (Liguori and Robinson, 2001) also examined the effect of caf- feine on response time in the driving simulator. In a similar study, researchers...

Extracted text: 15. The researchers cited in the previous problem (Liguori and Robinson, 2001) also examined the effect of caf- feine on response time in the driving simulator. In a similar study, researchers measured reaction time 30 minutes after participants consumed one 6-ounce cup of coffee. Using the same driving simulation task, for which the distribution of reaction times is normal with u = 400 msec and o = 40, they obtained a mean of M = 392 for a sample of n = a. Are the data sufficient to conclude that caffeine has a significant effect on reaction time? Use a two- tailed test with a = .05. 36 participants. %3D %3D D. Compute Cohen's d to estimate the size of the effect. C. Write a sentence describing the outcome of the hypothesis test and the measure of effect size as it would appear in a research report. - porth-