Chapter 9.4, Problem 1LC

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

A new over-the-counter cold medication includes a warning label stating that it “may cause drowsiness.” A researcher would like to evaluate this effect. It is know n that under regular circumstances the distribution of reaction times is normal with
*n* = 9 participants is obtained. Each person is given the new cold medication, and. 1 hour later, reaction time is measured for each individual. The average reaction time for this sample is *M* = 206 with *SS* = 648. The researcher would like to use a hypothesis test with

a. Use a two-tailed test with

b. Write a sentence that demonstrates how the outcome of the hypothesis test would appear in a research report.

c. Use a one-tailed lest with

d. Write a sentence that demonstrates how the outcome of the one-tailed hypothesis test would appear in a research report.

**a.**

To determine

**To test:** Whether there is any sufficient evidence to infer that the meditation has a significant effect on reaction time.

Explanation

**Given info:**

A two-tailed test with

**Calculations:**

*The test hypothesis is given below:*

*Null Hypothesis:*

*Alternative Hypothesis:*

*Degrees of freedom:*

*Critical value:*

For a one-tailed test with

*Test statistic:*

The standard error *s* is,

Calculate the estimated standard error s_{m} as:

**b.**

To determine

**To find:** The outcome of hypothesis test will appear in the research report.

**c.**

To determine

Whether the medication produces a significant increase in reaction time.

**d.**

To determine

**To find:** The outcome of hypothesis test will appear in the research report.

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