   Chapter 11, Problem 13P Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

Solutions

Chapter
Section Essentials of Statistics for the B...

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 MD = 2.7 (attractive photos rated higher) with s = 2.00. Are the data sufficient to conclude that there was a significant difference in perceived intelligence for the two sets of photos? Use a two-tailed test with α = .05.

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 n=25 .

Average difference was MD=2.7 .

Sample standard deviation was s=2 .

Level of significance for two tailed test is α=0.05 .

Calculation:

The hypotheses are given below:

Null Hypothesis: There is no difference in the perceived intelligence for the two sets of photos. That is μD=0 .

Alternate Hypothesis: There is significant difference in the perceived intelligence for the two sets of photos. That is μD0

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

t=MDμDsn=2

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Factoring Factor the expression completely. 28. 12x2y4 3xy5 + 9x3y2

Precalculus: Mathematics for Calculus (Standalone Book)

Evaluate the limit. limx0ex1tanx

Single Variable Calculus: Early Transcendentals, Volume I

Divide: 18x33x5

Elementary Technical Mathematics

In Problems 28-35, use the simplex method. Assume that all variables are nonnegative.

Mathematical Applications for the Management, Life, and Social Sciences

True or False: y = xex is a solution to y=y+yx.

Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th

The polar coordinates of the point P in the figure at the right are:

Study Guide for Stewart's Multivariable Calculus, 8th 