Transcript Review for Quiz 102 (Pie Charts)

Review For Quiz on Pie Charts
Constructing Pie Charts
Deconstructing Pie Charts
Select Vocabulary from Surveys & Variables
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What is a Pie Chart?
A pie chart or __________________________
______________________________________
______________________________________
What is another name for a Pie Chart?
_____________________________________
2
What is a Pie Chart?
A pie chart or circle graph has sectors that
visually display proportional parts of a total
set of data that share a common variable
Another name: Circle Graph
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4 Pie Chart Characteristics
1. Help________________________________
___________________________________.
2. Help _________________________________
____________________________________.
3. Especially useful _____________________.
4. Most effective when ____________________
____________________________________.
4
4 Pie Chart Characteristics
1. Help an audience understand distribution of
data quickly and easily.
2. Help to see how a total is divided into
categories
3. Especially useful with categorical data
4. Most effective when the number of segments
is 10 or fewer
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Reviewing Variable Types
1.
__________ (or __________)
2. __________ (or __________)
6
Variable Vocabulary:
Variables Come in 2 Varieties
1.
Categorical (or Qualitative)
2. Quantitative (or Numerical)
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Categorical
(Qualitative)
Types of
Quantitative
Variables
Variables
?1
Quantitative
(Numerical)
?2
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Categorical
(Qualitative)
Types of
Quantitative
Variables
Variables
Discrete
Quantitative
(Numerical)
Continuous
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Reviewing _________ Variables.
6 Characteristics
1. Recorded usually _________________
2. Records which of several ___________
_____________ belongs to
3. Count data in each ________, but
______________ should not ________
it
4. Can calculate ____________________
5. Includes all _____________________
6. Graphing:______________________
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Categorical Variables
1. Recorded usually with words
2. Records which of several groups an
individual belongs to
3. Count data in each group, but you
logically should not average it
4. Can calculate %age distributions
5. Includes all yes/no questions
6. Graphing: best illustrated with a pie
chart
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2 Types of Quantitative Variables
1. __________ If the Q variable is a set
of isolated points on the number
line, we call it this.
(i.e., it’s a number but it only comes
in certain values). Can be counted
2. __________ If the Q variable forms an entire
interval along the number line, we
call it this.
(i.e., it’s a number & it can be any
value). Can be measured
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2 Types of Quantitative Variables
1. Discrete
If the Q variable is a set
Quantitative of isolated points on the
number line, we call it this.
Variable
(i.e., it’s a number but it only comes
in certain values). Can be counted
2. Continuous If the Q variable forms an entire
Quantitative interval along the number line, we
Variable
call it this.
(i.e., it’s a number & it can be any
value). Can be measured
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Vocabulary from Surveys
1. Define a Population in a statistical sense:
_______________________________
2. Define Data in a statistical sense:
________________________________
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Vocabulary from Surveys
1. Define a Population in a statistical sense:
A population is an entire collection of
individuals or objects about which
information is desired.
2. Define Data in a statistical sense
Data are numbers collected in a
particular context. During a survey, the
interviewer collects it. It always has units.
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Vocabulary from Surveys
1. What is good data?
_______________________________
2. What is bad data?
________________________________
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Vocabulary from Surveys
1. Good Data in a statistical sense
Good Data is the result of intelligent
effort and good random sampling
methods.
2. Bad Data in a statistical sense
Bad Data are the result of laziness, lack
of understanding, the desire to mislead
others or bad sampling methods.
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End Review for Quiz
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Classwork & Homework
• Use the terms you’ve learned to
deconstruct pie charts
• Answer some the ‘usual’ questions about
the nature of the survey using the data
and your powers of analysis.
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Grape Production in Central CA 1998
Source: Grape Crush Report
Others
11.5%
Sample Size: 90,103 tonnes
Cabernet
Sauv.
24.0%
Merlot
12.4%
Zinfandel
8.1%
Cardonnay
43.9%
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Grape Crush Survey
Type of Grape
Tons
Produced
%
nrst 0.1

nrst 0.1
Total
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Grape Crush Survey
Type of Grape
Cabernet Sauv.
Cardonnay
Zinfandel
Merlot
Others
Total
Tons
Produced
21.7
39.6
7.3
11.2
10.3
90.1

%
nrst 0.1
24.0
43.9
8.1
12.4
11.5
100.0
nrst 0.1
86.5 °
158.1
29.3
44.8
41.3
360
°
°
°
°
°
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How A College Professor Spends Time
Outside
Consulting
6%
Research
16%
Teaching
51%
Prof Growth
5%
Community
Service
11%
Service to
College
11%
Source: Almanac of Higher Ed
Sample Size: 1400 hrs/yr
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Deconstruction of Pie
College Profs Time
Fill in Chart:
Outside Consulting
Research
Prof Growth
Community Serv
Service to College
Teaching
Total
# of Hours
%

°
°
°
°
°
°
°
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Deconstruction of Pie
College Profs Time
Key to Chart
Outside Consulting
Research
Prof Growth
Community Serv
Service to College
Teaching
Total
# of Hours
84
224
70
154
154
714
1400
%

6%
16%
5%
11%
11%
51%
100%
21.6
57.6
18.0
39.6
39.6
183.6
360
°
°
°
°
°
°
°
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Answering ?s About Profs
• What is question to answer?
• What is the population?
• Describe the sample: numbers, units other
description
• Variables? Q or C?
• Units or 2 categories
• Conclusions?
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Answering ?s About Profs
• What is question to answer?
– In teaching
• What is the population?
– Typical college professors
• Describe the sample: numbers, units other description
– ‘an average’ college professor
• Variables? Q or C?
– Time; Categorical
• Units or 2 categories
– Teaching, consulting, research, growth, comm serv, etc
• Conclusions?
– Most time is spent in teaching
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Top Broadband Players
Market Share 2009
Broadband
Market
Verizon
18.1%
Comcast
33.3%
Share
Time
Warner
19.2%
AT&T
29.4%
Source: Gartner
Sample Size: 45.9m subscribers
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Broadband Companies
Top Broadband Companies
# of Subscribers
%
nrst 0.1

nrst 0.1
°
°
°
°
°
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Broadband Companies
Top Broadband Companies
# of Subscribers
Comcast
15.3
AT&T
13.5
Time Warner
8.8
Verizon
8.3
Totals
45.9
%
33.3%
29.4%
19.2%
18.1%
100.0%
%
nrst 0.1
120.0
105.9
69.0
65.1
360

nrst 0.1
°
°
°
°
°
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Quiz #102
Test Taking Strategies
• What you need:
–
–
–
–
–
Graphing Calculator
Protractor
Compass
Pencil
Eraser
HW to the HW Box
• How you take test:
– Answer Vocabulary
– Then do #2
Deconstruction
– Then do #1
Construction of graph
WATCH THE TIME—
This test is longer
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