Essentials of Statistics for the B...

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



Essentials of Statistics for the B...

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 MD = 1.6 with SS = 150.

a. Do the data indicate that the cartoons are rated significantly funnier when the participants are smiling? Use a one-tailed test with α = .01.

b. Compute r2 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.


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


Given info:

The average of student MD is 1.6, variance SS is 150 and n is 25.


The null hypothesis:

H0:μD=0 (There is no difference between the two tests)

The alternative hypothesis:

H1:μD0 (There is difference between the two tests)

The sample variance:



The standard deviation of the mean:




To determine
The coefficient of the determination.


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

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

Additional Math Solutions

Find more solutions based on key concepts

Show solutions add

Quality Control The diameter x (in inches) of a batch of ball bearings manufactured by PAR Manufacturing satisf...

Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach

In Problems 45-48, determine the missing factor. 46.

Mathematical Applications for the Management, Life, and Social Sciences

In Exercises 1728, use the logarithm identities to obtain the missing quantity.

Finite Mathematics and Applied Calculus (MindTap Course List)

Find the slope of each line:

Elementary Technical Mathematics

True or False: If f(x) 0 for all x in an interval I then f is increasing on I.

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