Introductory Statistics (10th Edition)
10th Edition
ISBN: 9780321989178
Author: Neil A. Weiss
Publisher: PEARSON
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Textbook Question
Chapter 2.4, Problem 143E
In each of Exercises 2.140–2.149, we have provided a graphical display of a data set. For each exercise, state whether the distribution is (roughly) symmetric, right skewed, or left skewed.
2.143 The Coruro’s Burrow. The subterranean coruro (Spalacopus cyanus) is a social rodent that lives in large colonies in underground burrows that can reach lengths of up to 600 meters. Zoologists S. Begall and M. Gallardo studied the characteristics of the burrow systems of the subterranean coruro in central Chile and published their findings in the Journal of Zoology, London (Vol. 251, pp. 53–60). A sample of 51 burrows, whose depths were measured in centimeters, yielded the following frequency histogram.
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In Exercises 11–18, use the indicated data to construct the frequency distribution. (The data for Exercises 13–16 can be downloaded at TriolaStats.com.)
Burger King Lunch Service Times Refer to Data Set 25 “Fast Food” and use the drive-through service times for Burger King lunches. Begin with a lower class limit of 70 seconds and use a class width of 40 seconds.
A neighborhood is trying to set up school carpools, but they need to determine the number of students who need to travel to the elementary school (ages 5–10), the middle school (ages 11–13), and the high school (ages 14–18). A histogram summarizes their findings:
Histogram titled Carpool, with Number of Children on the y axis and Age Groups on the x axis. Bar 1 is 5 to 10 years old and has a value of 3. Bar 2 is 11 to 13 years old and has a value of 7. Bar 3 is 14 to 18 years old and has a value of 4.
Which of the following data sets is represented in the histogram?
A. {3, 3, 3, 7, 7, 7, 7, 7, 7, 7, 4, 4, 4, 4}
B. {5, 10, 4, 11, 12, 13, 12, 13, 12, 11, 14, 14, 19, 18}
C. {5, 6, 5, 11, 12, 13, 12, 13, 14, 15, 11, 18, 17, 13}
D. {3, 5, 10, 11, 13, 7, 18, 14, 4}
During one shift, the express lane clerk recorded how many times
customers violated the "10 items or less" rule for his lane. In particular,
he recorded how many items over the limit each violator placed on the
conveyor belt. This data is summarized in the histogram below. NOTE:
The last class actually represents "7 or more items," not just 7 items.
Frequency
14-
12
10-
8
4
2-
0.5
Answer:
1.5 2.5 3.5 4.5 5.5
#items over 10
6.5 7.5
What is the frequency of times the limit was exceeded by more than 2
items?
times
Q
Chapter 2 Solutions
Introductory Statistics (10th Edition)
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