Probability and Statistics for Engineering and the Sciences
9th Edition
ISBN: 9781305251809
Author: Jay L. Devore
Publisher: Cengage Learning
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Textbook Question
Chapter 14.2, Problem 18E
The article “A Probabilistic Analysis of Dissolved Oxygen–Biochemical Oxygen Demand Relationship in Streams” (J. Water Resources Control Fed., 1969: 73–90) reports data on the rate of oxygenation in streams at 20°C in a certain region. The sample mean and standard deviation were computed as
| Rate (per day) | Frequency |
| Below .100 | 12 |
| .100–below .150 | 20 |
| .150–below .200 | 23 |
| .200–below .250 | 15 |
| .250 or more | 13 |
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The article "A Probabilistic Analysis of Dissolved Oxygen-Biochemical Oxygen Demand Relationship in Streams"
(J. Water Resources Control Fed., 1969: 73-90) reported data on the rate of oxygenation in streams in a certain
region. The sample mean and standard deviation were computed as = 0.173 and s= 0.066, respectively.
We would like to know if a normal distribution could be a reasonable model for the data. To do this, we have
partitioned the quantitative variable into 5 discrete regions and counted the number of streams observed to
have oxygenation rates in the given interval. First determine the probability of falling into each region if the
normal distribution is the appropriate model. Then use those probabilities with the expected counts to conduct
a Chi-squared goodness of fit test. Use a = 0.05.
Frequency
12
20
23
15
13
Rate (per day)
Below .100
.100 below.150
.150 - below.200
.200 - below .250
.250 or more
Urinary fluoride concentration (in parts per million) was measured for both a sample of livestock that had been grazing in an area previously
exposed to fluoride pollution and a similar sample of livestock that had grazed in an unpolluted region. Do the accompanying data indicate
strongly that the mean fluoride concentration for livestock grazing in the polluted region is larger than that for livestock grazing in the
unpolluted region? Assume that the distributions of urinary fluoride concentration for both grazing areas have the same shape and spread.
Use a significance level of 0.05.
Group 1 (Polluted): 21.3 || 18.7 || 23.0 || 17.1 || 16.8 || 20.9 || 19.7
Group 2 (Unpolluted): 14.2 || 18.3 || 17.2 || 18.4 || 20.0
What is/are the Mann-Whitney Rank Sum critical value(s) for this problem?
Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.
a
43
b 56
n
58,33
d 60
Data on residential energy consumption per capita (measured in million BTU) had a mean of
70.8
and a standard deviation of
7.3
for the states
east of
the
Mississippi River.
Assume that the distribution of residential energy use is approximately unimodal and symmetric. Complete parts (a) through (d) below.
Chapter 14 Solutions
Probability and Statistics for Engineering and the Sciences
Ch. 14.1 - What conclusion would be appropriate for an...Ch. 14.1 - The article Racial Stereotypes in Childrens...Ch. 14.1 - It is hypothesized that when homing pigeons are...Ch. 14.1 - The article Application of Methods for Central...Ch. 14.1 - An information-retrieval system has ten storage...Ch. 14.1 - The article The Gap Between Wine Expert Ratings...Ch. 14.1 - Criminologists have long debated whether there is...Ch. 14.1 - The article Psychiatric and Alcoholic Admissions...Ch. 14.1 - Prob. 9ECh. 14.1 - Prob. 10E
Ch. 14.1 - Prob. 11ECh. 14.2 - Consider a large population of families in which...Ch. 14.2 - A study of sterility in the fruit fly (Hybrid...Ch. 14.2 - Prob. 14ECh. 14.2 - A certain type of flashlight is sold with the four...Ch. 14.2 - Let X = the number of adult police contacts for a...Ch. 14.2 - In a genetics experiment, investigators looked at...Ch. 14.2 - The article A Probabilistic Analysis of Dissolved...Ch. 14.2 - Each headlight on an automobile undergoing an...Ch. 14.2 - Prob. 20ECh. 14.2 - Prob. 21ECh. 14.2 - The article A Method for the Estimation of Alcohol...Ch. 14.2 - The article Nonbloated Burned Clay Aggregate...Ch. 14.3 - The accompanying two-way table was constructed...Ch. 14.3 - In an investigation of alcohol use among college...Ch. 14.3 - Contamination of various food products is an...Ch. 14.3 - The article Human Lateralization from Head to...Ch. 14.3 - Prob. 28ECh. 14.3 - The accompanying data on degree of spirituality...Ch. 14.3 - Three different design configurations are being...Ch. 14.3 - A random sample of smokers was obtained, and each...Ch. 14.3 - Eclosion refers to the emergence of an adult...Ch. 14.3 - Prob. 33ECh. 14.3 - Prob. 34ECh. 14.3 - Prob. 35ECh. 14.3 - Consider the accompanying 2 3 table displaying...Ch. 14 - The article Birth Order and Political Success...Ch. 14 - Does the phase of the moon have any bearing on...Ch. 14 - Prob. 39SECh. 14 - The authors of the article Predicting Professional...Ch. 14 - The accompanying two-way frequency table appears...Ch. 14 - Prob. 42SECh. 14 - Prob. 43SECh. 14 - Prob. 44SECh. 14 - Prob. 45SECh. 14 - The NCAA basketball tournament begins with 64...Ch. 14 - Have you ever wondered whether soccer players...Ch. 14 - Do the successive digits in the decimal expansion...Ch. 14 - Prob. 49SE
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