Chapter 8, Problem 11P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

The researchers cited in the previous problem (Liguori & Robinson. 2001) also examined the effect of caffeine 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
*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
*.*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.

**a.**

To determine

Whether caffeine has a significant effect on response time.

Explanation

**Given Info:**

The sample size is

**Calculation:**

The test hypotheses are,

*Null hypothesis:*

That is, caffeine has no significant effect on the response time.

*Alternative hypothesis:*

That is, caffeine has significant effect on the response time.

From the standard normal table, the critical region for the two tailed test with

**b.**

To determine

**To find:** The Cohen’s *d*.

**c.**

To determine

**To Describe:** The outcome of the hypothesis tests the measure of effect size.

Sect-8.1 P-1LCSect-8.1 P-2LCSect-8.1 P-3LCSect-8.1 P-1LCASect-8.1 P-2LCASect-8.1 P-3LCASect-8.2 P-1LCSect-8.2 P-2LCSect-8.2 P-3LCSect-8.2 P-4LC

Sect-8.2 P-5LCSect-8.3 P-1LCSect-8.3 P-2LCSect-8.3 P-3LCSect-8.3 P-4LCSect-8.3 P-5LCSect-8.4 P-1LCSect-8.4 P-2LCSect-8.4 P-3LCSect-8.5 P-1LCSect-8.5 P-2LCSect-8.5 P-3LCSect-8.6 P-1LCSect-8.6 P-2LCSect-8.6 P-3LCSect-8.6 P-4LCCh-8 P-1PCh-8 P-2PCh-8 P-3PCh-8 P-4PCh-8 P-5PCh-8 P-6PCh-8 P-7PCh-8 P-8PCh-8 P-9PCh-8 P-10PCh-8 P-11PCh-8 P-12PCh-8 P-13PCh-8 P-14PCh-8 P-15PCh-8 P-16PCh-8 P-17PCh-8 P-18PCh-8 P-19PCh-8 P-20PCh-8 P-21PCh-8 P-1RECh-8 P-2RECh-8 P-3RE

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