STATS:DATA+MODELS-W/DVD
4th Edition
ISBN: 9780321986498
Author: DeVeaux
Publisher: PEARSON
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Chapter 5, Problem 32E
To determine
Explain whether the standard deviation of the distribution of the number of fans at the rock concerts is 20, 200, 2,000 or 20,000 fans.
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14
A survey is conducted to determine whether
would prefer to work at home, if given the
20 office employees of a certain company
chance. The overall results are shown in the
first bar graph, and the results broken down
by gender are presented in the second.
a. Interpret the results of each graph.
b. Discuss the added value in including gen-
der in the second bar graph. (The second
bar graph in this problem is called a side
by side bar graph and is often used to
show results broken down by two or more
variables.)
c. Compare the side by side bar graph with
the two pie charts that you made for
Question 6. Which of the two methods is
best for comparing two groups, in your
opinion?
A
Would you prefer to work at home? (n=20)
60
50
40
Percent
20
30
20
30
10
0
No
Yes
Prefer to work at home? (10 males, 10 females)
80
Percent
60
00
40
40
20-
No
Yes
No
Yes
Female
Male
Frequency
12
Suppose that a random sample of 270 gradu-
ating seniors are asked what their immediate
priorities are, including whether buying a
house is a priority. The results are shown in
the following bar graph.
a. The bar graph is misleading; explain why.
b. Make a new bar graph that more fairly
presents the results.
Is Buying a House a Priority?
300
250
200
150
100
50
0
Yes
No
Undecided
Frequency
11
A polling organization wants to find out
what voters think of Issue X. It chooses a
random sample of voters and asks them
for their opinions of Issue X: yes, no, or
no opinion. I organize the results in the
following bar graph.
a. Make a frequency table of these results
(including the total number).
brocb. Evaluate the bar graph as to whether it
biz s b fairly represents the results.
of beau no
STORE TO OW! vd wob spind
550
540
500
vd
480
420
360
300
250
240
Yes
No
Undecided
Opinion on Issue X
Chapter 5 Solutions
STATS:DATA+MODELS-W/DVD
Ch. 5.1 - 1. Your statistics teacher has announced that the...Ch. 5.2 - Prob. 2JCCh. 5.2 - 4. A company manufactures wheels for in-line...Ch. 5.3 - 5. As a group, the Dutch are among the tallest...Ch. 5.3 - Prob. 5JCCh. 5 - Prob. 1ECh. 5 - 2. Mensa People with z-scores above 2.5 on an IQ...Ch. 5 - 3. Temperatures A town’s January high temperatures...Ch. 5 - 4. Placement exams An incoming freshman took her...Ch. 5 - 5. Shipments A company selling clothing on the...
Ch. 5 - 6. Hotline A company’s customer service hotline...Ch. 5 - 9. Guzzlers? Environmental Protection Agency (EPA)...Ch. 5 - 8. IQ Some IQ tests are standardized to a Normal...Ch. 5 - 17. Stats test, part II Suppose your Statistics...Ch. 5 - 13. Normal cattle The Virginia Cooperative...Ch. 5 - IQs revisited Based on the Normal model N(100, 16)...Ch. 5 - 11. Music library Corey has 4929 songs in his...Ch. 5 - 12. Wisconsin ACT math The histogram shows the...Ch. 5 - 19. Payroll Here are the summary statistics for...Ch. 5 - 20. Hams A specialty foods company sells “gourmet...Ch. 5 - 21. SAT or ACT? Each year thousands of high school...Ch. 5 - 22. Cold U? A high school senior uses the Internet...Ch. 5 - 11. Checkup One of the authors has an adopted...Ch. 5 - 23. Music library again Corey has 4929 songs in...Ch. 5 - 24. Windy In the last chapter, we looked at three...Ch. 5 - 25. Combining test scores The first Stats exam had...Ch. 5 - 26. Combining scores again The first Stat exam had...Ch. 5 - 27. Final exams Anna, a language major, took final...Ch. 5 - 28. MP3s Two companies market new batteries...Ch. 5 - 29. Cattle Using N(1152, 84), the Normal model for...Ch. 5 - 30. Car speeds 100 John Beale of Stanford,...Ch. 5 - Prob. 27ECh. 5 - Prob. 28ECh. 5 - Prob. 29ECh. 5 - Prob. 30ECh. 5 - Prob. 31ECh. 5 - Prob. 32ECh. 5 - Prob. 33ECh. 5 - Prob. 34ECh. 5 - Prob. 35ECh. 5 - 40. Rivets A company that manufactures rivets...Ch. 5 - Prob. 37ECh. 5 - Prob. 38ECh. 5 - Prob. 39ECh. 5 - Prob. 40ECh. 5 - Prob. 41ECh. 5 - 46. Customer database A large philanthropic...Ch. 5 - Prob. 43ECh. 5 - More IQs In the Normal model N(100, 16) from...Ch. 5 - Prob. 45ECh. 5 - Prob. 46ECh. 5 - Prob. 47ECh. 5 - 54. Tires A tire manufacturer believes that the...Ch. 5 - 55. Kindergarten Companies that design furniture...Ch. 5 - 56. Body temperatures Most people think that the...Ch. 5 - Prob. 51ECh. 5 - Prob. 52E
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