Essentials of Statistics for the Behavioral Sciences
8th Edition
ISBN: 9781133956570
Author: Frederick J Gravetter, Larry B. Wallnau
Publisher: Cengage Learning
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Chapter 13, Problem 15P
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 |
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Chapter 13 Solutions
Essentials of Statistics for the Behavioral Sciences
Ch. 13.2 - The F-ratio for the repeated-measures ANOVA is...Ch. 13.2 - A repeated-measures study is used to evaluate the...Ch. 13.2 - Prob. 2LCACh. 13.2 - Prob. 3LCACh. 13.2 - Prob. 1LCBCh. 13.2 - Prob. 2LCBCh. 13.3 - Prob. 1LCCh. 13.3 - It is impossible to have an interaction unless you...Ch. 13.3 - Prob. 1LCACh. 13.3 - Prob. 2LCA
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