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In a study examining the effect of caffeine on response time in the driving simulator, researchers...

In a study examining the effect of caffeine on response time in the driving simulator, researchers measured reaction time 30 minutes after participants consumed one 6-ouncee cup of coffee. Using a driving simulation task, for which the distribution of reaction time is normal with m=400 and s=40, they obtained a mean of M=392 for a sample of n=36 participants.

a. Are the data sufficient to conclude that caffeine has a significant effect on reaction time? Use a two-tailed test with a=.05.

b. 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.

Math   Statistics-And-Probability   
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Answer #1

(a)

(b)

The effect size will be

(c)

Since p-value is greater than 0.05 so the data are not sufficient to conclude that caffeine has a significant effect on reaction time. The effect is small

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