close solutoin list

The endorphins released by the brain act as natural painkillers. For example, Gintzler (1980) monitored endorphin activity and pain thresholds in pregnant rats during the days before they gave birth. The data showed an increase in pain threshold as the pregnancy progressed. The change was gradual until 1 or 2 days before birth, at which point there was an abrupt increase in pain threshold. Apparently a natural painkilling mechanism was preparing the animals for the stress of giving birth. The following data represent pain-threshold scores similar to the results obtained by Gintzler. Do these data indicate a significant change in pain threshold? Use a repeated measures ANOVA with α =.01. Days Before Giving Birth Subject 7 5 3 1 A 39 40 49 52 B 38 39 44 55 C 44 46 50 60 D 40 42 46 56 E. 34 33 41 52

BuyFind

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570
BuyFind

Essentials of Statistics for the B...

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

Solutions

Chapter
Section
Chapter 13, Problem 15P
Textbook Problem

The endorphins released by the brain act as natural painkillers. For example, Gintzler (1980) monitored endorphin activity and pain thresholds in pregnant rats during the days before they gave birth. The data showed an increase in pain threshold as the pregnancy progressed. The change was gradual until 1 or 2 days before birth, at which point there was an abrupt increase in pain threshold. Apparently a natural painkilling mechanism was preparing the animals for the stress of giving birth. The following data represent pain-threshold scores similar to the results obtained by Gintzler. Do these data indicate a significant change in pain threshold? Use a repeated measures ANOVA with α =.01.

Days Before Giving Birth
Subject 7 5 3 1
A 39 40 49 52
B 38 39 44 55
C 44 46 50 60
D 40 42 46 56
E. 34 33 41 52

Expert Solution
To determine
If the data indicate a significant change in pain threshold using repeated measure ANOVA with α=0.01.

Explanation of Solution

Given info:

Days before giving birth  
Subject 7 5 3 1 Total
A 39 40 45 52 P=180
B 38 39 44 55 P=176
C 44 46 50 60 P=200
D 40 42 46 56 P=184
E 34 33 41 52 P=160
  T=195M=39SS=52 T=200M=40SS=90 T=230M=46SS=54 T=275M=55SS=44 n=5k=4N=20G=500X2=41550

Calculation:

Total:

SStotal=X2G2N=41550(500)220=1050

And,

dftotal=N1=201=19

Within treatment:

SSwithintreatment=SSinsideeachtreatment=52+90+54+44=240

And,

dfwithintreatment=dfinsideeachtreatment=4+4+4+4=16

Between treatments:

For this example, we find SSbetweentreatment by subtraction

SSbetweentreatment=SStotalSSwithintreatment=1050240=810

And,

dfbetweentreatment=K1=41=3

Substitute for P, G, k and N,

SSbetweensubjects=P2kG2N

Want to see this answer and more?

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

See solution

Chapter 13 Solutions

Essentials of Statistics for the Behavioral Sciences
Show all chapter solutions
Ch. 13.3 - The following table summarizes the results from a...Ch. 13 - How does the denominator of the F-ratio (the error...Ch. 13 - The repeated-measures ANOVA can be viewed as a...Ch. 13 - A researcher conducts an experiment comparing...Ch. 13 - A researcher conducts a repeated-measures...Ch. 13 - A researcher uses a repeated-measures ANOVA to...Ch. 13 - A published report of a repeated-measures research...Ch. 13 - A recent study examined how applicants with a...Ch. 13 - One of the primary advantages of a...Ch. 13 - The following data are from an experiment...Ch. 13 - A researcher is evaluating customer satisfaction...Ch. 13 - The following summary table presents the results...Ch. 13 - A recent study indicates that simply giving...Ch. 13 - The following data represent the typical results...Ch. 13 - The endorphins released by the brain act as...Ch. 13 - The structure of a two-factor study can he...Ch. 13 - Explain what happens during each of the two stages...Ch. 13 - The following matrix presents the results from an...Ch. 13 - The following matrix presents the results of a...Ch. 13 - A researcher conducts an independent-measures,...Ch. 13 - A researcher conducts an independent-measures,...Ch. 13 - Some people like to pour beer gently down the side...Ch. 13 - Example 13.1 in this chapter described a...Ch. 13 - The following table summarizes the results from a...Ch. 13 - The following data are from a two-factor study...Ch. 13 - Research indicates that paying students to improve...Ch. 13 - A researcher examining the jet lag that people...Ch. 13 - The following data were obtained from a repeated-...Ch. 13 - Briefly describe what is meant by an interaction...Ch. 13 - Most sports injuries are immediate and obvious,...

Additional Math Textbook Solutions

Find more solutions based on key concepts
Show solutions
In Exercises 19-24, find the functions f + g, f g, fg, and fg. 20. f(x) = x1; g(x) = x3 + 1

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

The point P graphed at the right has spherical coordinates:

Study Guide for Stewart's Multivariable Calculus, 8th

If f(x) = 2e3x, f(x) = a) 2e3x b) 2xe3x c) 6e3x d) 6xe3x

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

Perform the operations and simplify. (an+2)(an1)

College Algebra (MindTap Course List)

In a test of the quality of two television commercials, each commercial was shown in a separate test area six t...

Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)

Reminder Round all answers to two decimal places unless otherwise indicated. Solving Exponential EquationsIn Ex...

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)

Convert 30,281 to base eight.

Mathematics: A Practical Odyssey

In Problems 914 use an appropriate infinite series method about x = 0 to find two solutions of the given differ...

A First Course in Differential Equations with Modeling Applications (MindTap Course List)