Chapter 11, Problem 13P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

Research results indicate that physically attractive people are also perceived as being more intelligent (Eagly, Ashmore, Makhijani, & Longo, 1991). As a demonstration of this phenomenon, a researcher obtained a set of 10 photographs, 5 showing men who were judged to be attractive and 5 showing men who were judged to be unattractive. The photographs were shown to a sample of *n =* 25 college students and the students were asked to rate the intelligence of the person in the photo on a scale from 1 to 10. For each student, the researcher determined the average rating for the 5 attractive photos and the average for the 5 unattractive photos, and then computed the difference between the two scores. For the entire sample, the average difference was *M _{D} =* 2.7 (attractive photos rated higher) with

To determine

**To check:** Whether there is a significant difference in perceived intelligence for the two sets of photos.

Explanation

**Given info:**

Numbers of college students in the sample are

Average difference was

Sample standard deviation was

Level of significance for two tailed test is

**Calculation:**

The hypotheses are given below:

*Null Hypothesis:* There is no difference in the perceived intelligence for the two sets of photos. That is

*Alternate Hypothesis:* There is significant difference in the perceived intelligence for the two sets of photos. That is

In repeated-measures study, *t* statistic under null hypothesis is given by:

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