Review For Quiz on Pie Charts
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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?
_____________________________________
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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 ____________________ ____________________________________.
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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 __________)
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Variable Vocabulary:Variables Come in 2 Varieties
1. Categorical (or Qualitative)
2. Quantitative (or Numerical)
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Types of Quantitative
Variables
Categorical(Qualitative)
Variables ? 1
Quantitative(Numerical)
? 2
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Types of Quantitative
Variables
Categorical(Qualitative)
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. (i.e., it’s a number but it only comes in certain values). Can be counted
2. ContinuousIf 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
Variable
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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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Cabernet Sauv.24.0%
Cardonnay43.9%
Zinfandel8.1%
Merlot12.4%
Others11.5%
Source: Grape Crush Report Sample Size: 90,103 tonnes
Grape Production in Central CA 1998
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Grape Crush Survey
Tons %
Type of Grape Produced nrst 0.1 nrst 0.1
Total
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Grape Crush Survey
Tons %
Type of Grape Produced nrst 0.1 nrst 0.1
Cabernet Sauv. 21.7 24.0 86.5 °
Cardonnay 39.6 43.9 158.1 °
Zinfandel 7.3 8.1 29.3 °
Merlot 11.2 12.4 44.8 °
Others 10.3 11.5 41.3 °
Total 90.1 100.0 360 °
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Outside Consulting
6%
Research16%
Prof Growth5%
Community Service
11%
Service to College
11%
Teaching51%
Source: Almanac of Higher Ed Sample Size: 1400 hrs/yr
How A College Professor Spends Time
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Deconstruction of PieCollege Profs Time
Fill in Chart: # of Hours %
Outside Consulting °
Research °
Prof Growth °
Community Serv °
Service to College °
Teaching °
Total °
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Deconstruction of PieCollege Profs Time
Key to Chart # of Hours %
Outside Consulting 84 6% 21.6 °Research 224 16% 57.6 °Prof Growth 70 5% 18.0 °Community Serv 154 11% 39.6 °Service to College 154 11% 39.6 °Teaching 714 51% 183.6 °Total 1400 100% 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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Comcast33.3%
AT&T29.4%
Time Warner19.2%
Verizon18.1%
Top Broadband Players Market Share 2009
Source: Gartner Sample Size: 45.9m subscribers
Broadband
Market
Share
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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 % nrst 0.1 nrst 0.1
Comcast 15.3 33.3% 120.0 °
AT&T 13.5 29.4% 105.9 °
Time Warner 8.8 19.2% 69.0 °
Verizon 8.3 18.1% 65.1 °
Totals 45.9 100.0% 360 °
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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