1

Review For Quiz on Pie Charts

Constructing Pie Charts

Deconstructing Pie Charts

Select Vocabulary from Surveys & Variables

2

What is a Pie Chart?

A pie chart or __________________________

______________________________________

______________________________________

What is another name for a Pie Chart?

_____________________________________

3

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

4

4 Pie Chart Characteristics

1. Help________________________________ ___________________________________.

2. Help _________________________________ ____________________________________.

3. Especially useful _____________________.

4. Most effective when ____________________ ____________________________________.

5

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

6

Reviewing Variable Types

1. __________ (or __________)

2. __________ (or __________)

7

Variable Vocabulary:Variables Come in 2 Varieties

1. Categorical (or Qualitative)

2. Quantitative (or Numerical)

8

Types of Quantitative

Variables

Categorical(Qualitative)

Variables ? 1

Quantitative(Numerical)

? 2

9

Types of Quantitative

Variables

Categorical(Qualitative)

Variables Discrete

Quantitative(Numerical)

Continuous

10

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:______________________

11

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

12

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

13

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

14

Vocabulary from Surveys

1. Define a Population in a statistical sense: _______________________________

2. Define Data in a statistical sense: ________________________________

15

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.

16

Vocabulary from Surveys

1. What is good data? _______________________________

2. What is bad data? ________________________________

17

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.

18

End Review for Quiz

19

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.

20

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

21

Grape Crush Survey

Tons %

Type of Grape Produced nrst 0.1 nrst 0.1

Total

22

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 °

23

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

24

Deconstruction of PieCollege Profs Time

Fill in Chart: # of Hours %

Outside Consulting °

Research °

Prof Growth °

Community Serv °

Service to College °

Teaching °

Total °

25

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 °

26

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?

27

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

28

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

29

Broadband Companies

Top Broadband Companies %

# of Subscribers nrst 0.1 nrst 0.1

°

°

°

°

°

30

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 °

31

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