Chapter 11, Problem 11P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

Strode, Martin, and Stepper (1988) reported that people rate cartoons as funnier when bolding a pen in their teeth (which forced them to smile) than when holding a pen in their lips (which forced them to frown). A researcher attempted in replicate this result using a simple of *n* = 25 adults between the ages of 40 and 45. For each person, the researcher recorded the difference between the rating obtained while smiling and the rating obtained while frowning. On average the cartoons were rated as funnier when the participants were smiling, with an average difference of *M _{D}* = 1.6 with

a. Do the data indicate that the cartoons are rated significantly funnier when the participants are smiling? Use a one-tailed test with

b. Compute r^{2} to measure the size of the treatment 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

The significance change in the problem solving ability using one tail test.

Explanation

**Given info:**

The average of student

**Calculation:**

*The null hypothesis:*

The alternative hypothesis:

*The sample variance:*

*The standard deviation of the mean:*

**b**.

To determine

The coefficient of the determination.

**c**.

To determine

The Cohen’s
d to measure the size of the effect.

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