Statistics for The Behavioral Sciences (MindTap Course List)
10th Edition
ISBN: 9781305504912
Author: Frederick J Gravetter, Larry B. Wallnau
Publisher: Cengage Learning
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Chapter 13, Problem 11P
The endorphins released by the brain act as natural painkillers. For example, Gintzler (1970) 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
| Day 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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Hoaglin, Mosteller, and Tukey (1983) presented data on blood levels of beta-endorphin as a function of stress. They took beta-endorphin levels for 19 patients 12 hours before surgery and again 10 minutes before surgery. The data are presented below, in fmol/ml
Based on these data, what effect does increased stressed have on endorphin levels.
include:
the hypotheses tested (H0 and H1),
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the conclusion as it relates to the research question.
Participant 12 hours before 10 minutes before
1 10 6.5
2 6.5 14.0
3 8.0 13.5
4 12 18
5 5.0 14.5
6 11.5…
Chapter 13 Solutions
Statistics for The Behavioral Sciences (MindTap Course List)
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 four...Ch. 13 - A researcher conducts a repeated-measures...Ch. 13 - The following data were obtained from a repeated-...Ch. 13 - The following data represent the results of a...Ch. 13 - The following data were obtained from a repeated-...Ch. 13 - The following data were obtained from a repeated-...Ch. 13 - For the data in problem 8, a. Compute SStotal and...Ch. 13 - In the Preview section for this chapter, we...
Ch. 13 - The endorphins released by the brain act as...Ch. 13 - A researcher is evaluating customer satisfaction...Ch. 13 - The following summary table presents the results...Ch. 13 - The following summary table presents the results...Ch. 13 - A researcher uses a repeated-measures ANOVA to...Ch. 13 - A published report of a repeated-measures research...Ch. 13 - The following data are from a repeated-measures...Ch. 13 - The following data were obtained from a repeated-...Ch. 13 - In Problem 18 the data show large and consistent...Ch. 13 - A recent study indicates that simply giving...Ch. 13 - One of the primary advantages of a...Ch. 13 - One of the primary advantages of a...Ch. 13 - The following data are from an experiment...Ch. 13 - The following data are from a repeated-measures...Ch. 13 - In the Preview section for Chapter 2 we presented...Ch. 13 - A repeated-measures experiment comparing only two...Ch. 13 - For either independent-measures or...
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