Chapter 1
(1.5)
“For all the speeches given, the commercials
aired, the mud splattered in any election, a hefty percentage of people decide
whom they will vote for only at the last minute.” Suppose that a sample of people were asked, “When
did you finally decide whom to vote for in the presidential election?” These answers were given:
Answer Percent
Only in the past 3 days 17%
In the past week 8
In the past 2 weeks (after the debates) 18
In early fall (after the convention) 24
Earlier than that 33
a.
Would you
use a pie chart or a bar chart to graphically describe the data? Why?
Yes, because
the given data are in percentage rate. The pie chart is the best
way
to graphically describe the percentage data.
b. Draw the chart you chose in part a.
c. What does the chart tell you about the reliability of
election polls taken early in the election campaign?
The chart tells
that many of the sample persons have decided already earlier than the debates, conventions, and any
presidential election activities of whom they will vote in the presidential election. Which mean that nowadays
people are responsible enough of their
right to vote. Few only had chosen their presidential candidate in the past week. Only mean that many people don’t
believe in the advertisements or campaigns
done by the presidential candidates.
(1.8) The table shows the average ticket prices for the
top 20 Broadway shows during the week of July 30-August 5, 2001:
|
Show
|
Average
Ticket Price
|
Show
|
Average
Ticket Price
|
|
1. The Producers
|
$78
|
11. Annie
Get Your Gun
|
$53
|
|
2. The Lion King
|
71
|
12. Chicago
|
53
|
|
3. Aida
|
67
|
13. Kiss Me Kate
|
55
|
|
4. 42nd Street
|
68
|
14. Rent
|
49
|
|
5. Beauty and the Beast
|
62
|
15. Cabaret
|
64
|
|
6. The Phantom of the Opera
|
61
|
16. Contact
|
62
|
|
7. The Music Man
|
60
|
17. Proof
|
58
|
|
8. Riverdance
|
48
|
18. Fosse
|
53
|
|
9. The Full Monty
|
71
|
19. Blast!
|
41
|
|
10. Les
Miserables
|
50
|
20. The
Tale of the Allergist’s Wife
|
48
|
- Draw a stem and leaf plot for the data. Describe the shape of the distribution. Are there any outliers?
4 8 9 1 8 REORDER: 4 1 8 8 9
5
0 3 3 5 8 3 5 0 3 3 3 5 8
6
7 8 2 1 0 4 2 6 0 1 2 2 4 7 8
7
8 1 1 7 1 1 8
The shape of the distribution is skewed
right.
There is no outlier.
- Construct a dotplot for the data.
Which of the two graphs is more informative? Explain.
For me, the dotplot is more
informative because it is easy to read than the stem and leaf plot. Dotplot has
the advantage of easy to understand the data given. Unlike in the
stem and plot you
need to analyze what would be the left unit.
(1.12) There
is
an increasing demand among consumers for broadband Internet access, which will
increase the speed at which they can access the Internet. Cable currently leads the broadband market
over DSL and up-and-coming satellite access, and it is predicted that cable
will continue to dominate the U.S. residential broadband market over the next 4
years. 15
Broadband Access in
2005
(U.S. – Year end 2005)
|
Technology
|
Subscribers
|
|
Cable
|
15.7 Million
|
|
DSL
|
10.5 Million
|
|
Satellite
|
4.5 Million
|
|
Fixed Wireless
|
359,000
|
Source: The Yankee Group
SOLUTIONS:
|
Technology
|
Subscribers
|
Relative Frequency
|
Percentage
|
|
Cable
|
15.7
Million
|
15.7M/31.059M
= 0.505
|
50.5%
|
|
DSL
|
10.5
Million
|
10.5M/31.059M
= 0.338
|
33.8%
|
|
Satellite
|
4.5
Million
|
4.5M/31.059M
= 0.145
|
14.5%
|
|
Fixed Wireless
|
359, 000
|
359,
000/31.059M = 0.012
|
1.2%
|
|
Total
|
31.059 Million
|
|
100%
|
Source: Fictitious
data, for illustration purposes only
- Use a pie chart to describe the predicted broadband market in 2005.
- Use a bar chart to describe the predicted broadband market in 2005.
- Which of the two graphical methods is less susceptible to distortion by the presenter?
For me, the
less susceptible to distortion is the bar graph. Bar graph because in pie graph
the division of parts is needed. Unlike in the bar graph, it provides a visual presentation of
categorical data. Categorical data is a
grouping of data into discrete groups, such as months of the year, age group,
shoe sizes, and eye colors. In a column bar chart, the categories appear along
the horizontal axis; the height of the bar corresponds to the value of each category.
(1.20) Getting Up to Speed Small
businesses continue to rely on the telephone as their primary communication
tool, using the Internet primarily as an information source. A research survey conducted by Covad/Sprint/Equation Research indicates
that most small businesses are only beginning to adopt broadband Internet
access.
Small Business Internet Access Methods
|
Dial-up/modem
DSL/ADSL broadband
Cable broadband
T1 or higher
Other
|
31.7%
30.3%
26.1%
9.8%
2.1%
|
Source: www.clickz.com
a.
Do the percentages add up to 100%?
YES.
31.7
30.3
26.1
9.8
+ 2.1
-----------------
100
b.
Use a pie chart to describe the Internet access
methods used by small businesses.
(1.21) Internet
Hotspots The most visited site on the Internet is
Yahoo!, which boasted 111,271 thousand unique visitors in December 2003. The number of unique visitors at the top 25
sites are shown in the table:
|
Site
|
Unique
Visitors
(Millions)
|
|
Site
|
Unique
Visitors
(Millions)
|
|
Yahoo! Sites
Time Warner Network
MSN-Microsoft Sites
EBay
Google Sites
Terra Lycos
Amazon Sites
About/Primedia
Excite Network
CNET Networks
Walt Disney Internet
Viacom Online
American Greetings
|
111.3
110.5
110.0
69.2
61.5
52.1
45.7
42.6
25.1
25.1
25.1
24.7
24.4
|
|
Weather Channel
Real.com Network
Verizon Communications
Wal-Mart
Shopping.com Sites
Symantec
AT&T Properties
InfoSpace Network
Monster Property
EA Online
SBC Communications
Sony Online
|
23.8
22.3
22.1
21.4
21.3
19.9
17.5
17.3
17.3
16.8
16.5
16.5
|
a.
Look at the data. Can you guess the approximate
shape of the data distribution?
YES,
because the data are arranged from highest to lowest.
b.
Use the second applet in Building a Histogram to construct a relative frequency histogram
for the data. What is the shape of the
distribution?
|
Site
|
Unique Visitors (Millions)
|
Relative Frequency
|
Percentage
|
|
Yahoo! Sites
|
111.3
|
111.3/960 = 0.1159
|
11.60
|
|
Time Warner Network
|
110.5
|
110.5/960 = 0.1151
|
11.51
|
|
MSN-Microsoft Sites
|
110.0
|
110.0/960 = 0.1146
|
11.46
|
|
EBay
|
69.2
|
69.2/960 = 0.0721
|
7.21
|
|
Google Sites
|
61.5
|
61.5/690 = 0.0641
|
6.41
|
|
Terra Lycos
|
52.1
|
52.1/960 = 0.0543
|
5.43
|
|
Amazon Sites
|
45.7
|
45.7/960 = 0.0476
|
4.76
|
|
About/Primedia
|
42.6
|
42.6/960 = 0.0444
|
4.44
|
|
Excite Network
|
25.1
|
25.1/960 = 0.0261
|
2.61
|
|
CNET Networks
|
25.1
|
25.1/960 = 0.0261
|
2.61
|
|
Walt Disney Internet
|
25.1
|
25.1/960 = 0.0261
|
2.61
|
|
Viacom Online
|
24.7
|
24.7/960 = 0.0257
|
2.57
|
|
American Greetings
|
24.4
|
24.4/960 = 0.0254
|
2.54
|
|
Weather Channel
|
23.8
|
23.8/960 = 0.0248
|
2.48
|
|
Real.com Network
|
22.3
|
22.3/960 = 0.0232
|
2.32
|
|
Verizon Communications
|
22.1
|
22.1/960 = 0.0230
|
2.30
|
|
Wal-Mart
|
21.4
|
21.4/960 = 0.0223
|
2.23
|
|
Shopping.com Site
|
21.3
|
21.3/960 = 0.0222
|
2.22
|
|
Symantec
|
19.9
|
19.9/960 =0.0207
|
2.08
|
|
AT&T Properties
|
17.5
|
17.5/960 = 0.0182
|
1.82
|
|
InfoSpace Network
|
17.3
|
17.3/960 = 0.0180
|
1.80
|
|
Monster Property
|
17.3
|
17.3/960 = 0.0180
|
1.80
|
|
EA Online
|
16.8
|
16.8/960 = 0.0175
|
1.75
|
|
SBC Communications
|
16.5
|
16.5/960 = 0.0172
|
1.72
|
|
Sony Online
|
16.5
|
16.5/960 = 0.0172
|
1.72
|
|
Total
|
960
|
|
100
|
Source:
Fictitious data, for illustration purposes only
c.
Are there any outliers in the set? If so, what sites boast an unusually large
number of unique visitors?
YES if you based in the dotplot of
the relative frequency of each sites . The sites that boast an unusually large
number of unique visitors are Yahoo sites, Time Warner Network and
MSN-Microsoft Sites.
----------------
:D If you want the microsoft document file of this, message me at my yahoo account.
miss_yannie@ymail.com
that's it!
All those presented above are my answers.
I am not saying those are correct.
They are just MY ANSWERS....
:D
sweet,
LRJG :D
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