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9th Edition
ISBN: 9781305779372
Author: Jay L. Devore
Publisher: Cengage Learning
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Chapter 10, Problem 36SE
Cortisol is a hormone that plays an important role in mediating stress. There is growing awareness that exposure of outdoor workers to pollutants may impact cortisol levels. The article “Plasma Cortisol Concentration and Lifestyle in a Population of Outdoor Workers”(Intl. J. of Envir. Health Res2011: 62-71) reported on a study involving three groups of police officers: (1) traffic police (TP), (2) drivers (D), and (3) other duties (O). Here is summary data on cortisol concentration (ng/ml) for a subset of the officers who neither drank nor smoked.
| Group | Sample Size | SD | |
| TP | 47 | 174.7 | 50.9 |
| D | 36 | 160.2 | 37.2 |
| O | 50 | 153.5 | 45.9 |
Assuming that the standard assumptions for one-way ANOVA are satisfied, carry out a test at significance level .05 to decide whether true average cortisol concentration is different for the three groups.[Note:The investigators used more sophisticated statistical methodology (multiple regression) to assess the impact of age, length of employment, and drinking and smoking status on cortisol concentration; taking these factors into account, concentration appeared to be significantly higher in the TP group than in the other two groups.]
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Cortisol is a hormone that plays an important role in mediating stress. There is a growing
awareness that exposure of outdoor workers to pollutants may impact cortisol levels. The
article "Plasma Cortisol Concentration and Lifestyle in a Population of Outdoor Workers"
(International Journal of Environmental Health Res., 2011: 62-71) reported on a study involving
three groups of police officers:
1. Traffic Police (TP)
2. Drivers (D)
3. Other Duties (0)
Here is summary data on cortisol concentration (ng/ml) for a subset of the officers who neither
drank nor smoked.
Group Sample Size Mean SD
TP
174.7 50.9
160.2
37.2
153.5 45.9
44
44
44
Assuming that the standard assumptions for one-way ANOVA are satisfied, carry out a test at
significance level 0.05 to decide whether the true average cortisol concentration is different for
the three groups. If any differences exist, state which groups are different.
The article "Effect of Refrigeration on the Potassium Bitartrate Stability and Composition
of Italian Wines" (A. Versari, D. Barbanti, et al., Italian Journal of Food Science, 2002:45-
52) reports a study in which eight types of white wine had their tartaric acid concentration
(in g/L) measured both before and after a cold stabilization process. The results are
presented in the following table:
Wine Type
Before
After
Difference
2.86
2.59
0.27
2.85
2.47
0.38
3
1.84
1.58
0.26
4
1.60
1.56
0.04
0.80
0.78
0.02
6.
0.89
0.66
0.23
2.03
1.87
0.16
1.90
1.71
0.19
Find a 95% confidence interval for the mean difference between the tartaric acid
concentrations before and after the cold stabilization process.
The article "Determination of Carboxyhemoglobin Levels and Health Effects on Officers
Working at the Istanbul Bosphorus Bridge" (G. Kocasoy and H. Yalin, Journal of
Environmental Science and Health, 2004:1129–1139) presents assessments of health
outcomes of people working in an environment with high levels of carbon monoxide (CO).
Following are the numbers of workers reporting various symptoms, categorized by work
shift. The numbers were read from a graph.
Shift
Morning
Evening
Night
Influenza
16
13
18
Headache
24
33
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11
16
5
Shortness of Breath
Can you conclude that the proportions of workers with the various symptoms differ among
the shifts?
Chapter 10 Solutions
Bundle: Probability and Statistics for Engineering and the Sciences, 9th + WebAssign Printed Access Card for Devore's Probability and Statistics for ... and the Sciences, 9th Edition, Single-Term
Ch. 10.1 - In an experiment to compare the tensile strengths...Ch. 10.1 - Suppose that the compression-strength observations...Ch. 10.1 - The lumen output was determined for each of I = 3...Ch. 10.1 - It is common practice in many countries to destroy...Ch. 10.1 - Consider the following summary data on the modulus...Ch. 10.1 - The article Origin of Precambrian Iron Formations...Ch. 10.1 - An experiment was carried out to compare...Ch. 10.1 - A study of the properties of metal plate-connected...Ch. 10.1 - Six samples of each of four types of cereal grain...Ch. 10.1 - In single-factor ANOVA with I treatments and J...
Ch. 10.2 - An experiment to compare the spreading rates of...Ch. 10.2 - In Exercise 11, suppose x3. = 427.5. Now which...Ch. 10.2 - Prob. 13ECh. 10.2 - Use Tukeys procedure on the data in Example 10.3...Ch. 10.2 - Exercise 10.7 described an experiment in which 26...Ch. 10.2 - Reconsider the axial stiffness data given in...Ch. 10.2 - Prob. 17ECh. 10.2 - Consider the accompanying data on plant growth...Ch. 10.2 - Prob. 19ECh. 10.2 - Refer to Exercise 19 and suppose x1 = 10, x2 = 15,...Ch. 10.2 - The article The Effect of Enzyme Inducing Agents...Ch. 10.3 - The following data refers to yield of tomatoes...Ch. 10.3 - Apply the modified Tukeys method to the data in...Ch. 10.3 - The accompanying summary data on skeletal-muscle...Ch. 10.3 - Lipids provide much of the dietary energy in the...Ch. 10.3 - Samples of six different brands of diet/imitation...Ch. 10.3 - Although tea is the worlds most widely consumed...Ch. 10.3 - For a single-factor ANOVA with sample sizes Ji(i =...Ch. 10.3 - When sample sizes are equal (Ji = J). the...Ch. 10.3 - Reconsider Example 10.8 involving an investigation...Ch. 10.3 - When sample sizes are not equal, the non...Ch. 10.3 - In an experiment to compare the quality of four...Ch. 10.3 - Prob. 33ECh. 10.3 - Simplify E(MSTr) for the random effects model when...Ch. 10 - An experiment was carried out to compare flow...Ch. 10 - Cortisol is a hormone that plays an important role...Ch. 10 - Numerous factors contribute to the smooth running...Ch. 10 - An article in the British scientific journal...Ch. 10 - Prob. 39SECh. 10 - Prob. 40SECh. 10 - Prob. 41SECh. 10 - The critical flicker frequency (cff) is the...Ch. 10 - Prob. 43SECh. 10 - Four types of mortarsordinary cement mortar (OCM)....Ch. 10 - Prob. 45SECh. 10 - Prob. 46SE
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