## Presentation on theme: "Chap 2-"— Presentation transcript

Slide1

Chap 2-1

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-1

Chapter 2Organizing and Visualizing Data

Basic Business Statistics

12

th

EditionSlide2

Chap 2-2

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Chap 2-2

Learning Objectives

In this chapter you learn:

The sources of data used in business

To construct tables and charts for numerical data

To construct tables and charts for categorical data

The principles of properly presenting graphsSlide3

Chap 2-3

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A Step by Step Process For Examining & Concluding From Data Is Helpful

In this book we will use DCOVADefine the variables for which you want to reach conclusions

C

ollect

the data from appropriate sources

O

rganize

the data collected by developing tables

V

isualize

the data by developing charts

Analyze the data by examining the appropriate tables and charts (and in later chapters by using other statistical methods) to reach conclusions

Chap 2-

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Chap 2-4

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Why Collect Data?

A marketing research analyst needs to assess the effectiveness of a new television advertisement.A pharmaceutical manufacturer needs to determine whether a new drug is more effective than those currently in use.

An operations manager wants to monitor a manufacturing process to find out whether the quality of the product being manufactured is conforming to company standards.

An auditor wants to review the financial transactions of a company in order to determine whether the company is in compliance with generally accepted accounting principles.

Chap 2-

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Chap 2-5

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Sources of Data

Primary Sources: The data collector is the one using the data for analysisData from a political survey

Data collected from an experiment

Observed data

Secondary Sources

: The person performing data analysis is not the data collector

Analyzing census data

Examining data from print journals or data published on the internet.

Chap 2-

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Chap 2-6

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Sources of data fall into four categoriesData distributed by an organization or an individual

A designed experimentA surveyAn observational study

Chap 2-

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Chap 2-7

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Examples Of Data Distributed By Organizations or IndividualsFinancial data on a company provided by investment services

Industry or market data from market research firms and trade associationsStock prices, weather conditions, and sports statistics in daily newspapers

Chap 2-

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Chap 2-8

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Examples of Data FromA Designed ExperimentConsumer testing of different versions of a product to help determine which product should be pursued further

Material testing to determine which supplier’s material should be used in a productMarket testing on alternative product promotions to determine which promotion to use more broadly

Chap 2-

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Chap 2-9

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Examples of Survey DataPolitical polls of registered voters during political campaignsPeople being surveyed to determine their satisfaction with a recent product or service experience

Chap 2-9

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Chap 2-10

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Examples of Data From Observational StudiesMarket researchers utilizing focus groups to elicit unstructured responses to open-ended questions

Measuring the time it takes for customers to be served in a fast food establishmentMeasuring the volume of traffic through an intersection to determine if some form of advertising at the intersection is justified

Chap 2-

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Chap 2-11

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Categorical Data Are Organized By Utilizing Tables

Chap 2-11

Categorical Data

Tallying Data

Summary Table

DC

O

VA

One Categorical Variable

Two Categorical Variables

Contingency TableSlide12

Chap 2-12

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Chap 2-12

Organizing Categorical Data: Summary Table

A

summary table

indicates the frequency, amount, or percentage of items in a set of categories so that you can see differences between categories.

Banking Preference?

Percent

ATM

16%

Automated or live telephone

2%

Drive-through service at branch

17%

In person at branch

41%

Internet

24%

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Summary Table From A Survey of 1000 Banking CustomersSlide13

Chap 2-13

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A Contingency Table Helps Organize Two or More Categorical VariablesUsed to study patterns that may exist between the responses of two or more categorical variables

Cross tabulates or tallies jointly the responses of the categorical variablesFor two variables the tallies for one variable are located in the rows and the tallies for the second variable are located in the columns

Chap 2-

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Chap 2-14

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Contingency Table - ExampleA random sample of 400 invoices is drawn.Each invoice is categorized as a small, medium, or large amount.

Each invoice is also examined to identify if there are any errors.These data are then organized in the contingency table to the right.

Chap 2-

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No

Errors

Errors

Total

Small

Amount

170

20

190

Medium

Amount

100

40

140

Large

Amount

65

5

70

Total

335

65

400

Contingency Table Showing

Frequency of Invoices Categorized

By Size and The Presence Of ErrorsSlide15

Chap 2-15

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Contingency Table Based On Percentage of Overall Total

Chap 2-15

No

Errors

Errors

Total

Small

Amount

170

20

190

Medium

Amount

100

40

140

Large

Amount

65

5

70

Total

335

65

400

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No

Errors

Errors

Total

Small

Amount

42.50%

5.00%

47.50%

Medium

Amount

25.00%

10.00%

35.00%

Large

Amount

16.25%

1.25%

17.50%

Total

83.75%

16.25%

100.0%

42.50% = 170 / 400

25.00% = 100 / 400

16.25% = 65 / 400

83.75% of sampled invoices have no errors and 47.50% of sampled invoices are for small amounts.Slide16

Chap 2-16

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Contingency Table Based On Percentage of Row Totals

Chap 2-16

No

Errors

Errors

Total

Small

Amount

170

20

190

Medium

Amount

100

40

140

Large

Amount

65

5

70

Total

335

65

400

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No

Errors

Errors

Total

Small

Amount

89.47%

10.53%

100.0%

Medium

Amount

71.43%

28.57%

100.0%

Large

Amount

92.86%

7.14%

100.0%

Total

83.75%

16.25%

100.0%

89.47% = 170 / 190

71.43% = 100 / 140

92.86% = 65 / 70

Medium invoices have a larger chance (28.57%) of having errors than small (10.53%) or large (7.14%) invoices.Slide17

Chap 2-17

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Contingency Table Based On Percentage Of Column Total

Chap 2-17

No

Errors

Errors

Total

Small

Amount

170

20

190

Medium

Amount

100

40

140

Large

Amount

65

5

70

Total

335

65

400

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No

Errors

Errors

Total

Small

Amount

50.75%

30.77%

47.50%

Medium

Amount

29.85%

61.54%

35.00%

Large

Amount

19.40%

7.69%

17.50%

Total

100.0%

100.0%

100.0%

50.75% = 170 / 335

30.77% = 20 / 65

There is a 61.54% chance that invoices with errors are of medium size.Slide18

Chap 2-18

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Chap 2-18

Tables Used For Organizing Numerical Data

Numerical Data

Ordered Array

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Cumulative

Distributions

Frequency

DistributionsSlide19

Chap 2-19

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Chap 2-19

Organizing Numerical Data: Ordered Array

An

ordered array

is a sequence of data, in rank order, from the smallest value to the largest value.

Shows range (minimum value to maximum value)

May help identify outliers (unusual observations)

Age of Surveyed College Students

Day Students

16

17

17

18

18

18

19

19

20

20

21

22

22

25

27

32

38

42

Night Students

18

18

19

19

20

21

23

28

32

33

41

45

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Chap 2-20

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Chap 2-20

Organizing Numerical Data: Frequency Distribution

The

frequency distribution

is a summary table in which the data are arranged into numerically ordered classes.

You must give attention to selecting the appropriate

number

of

class groupings

for the table, determining a suitable

width

of a class grouping, and establishing the

boundaries

of each class grouping to avoid overlapping.

The number of classes depends on the number of values in the data. With a larger number of values, typically there are more classes. In general, a frequency distribution should have at least 5 but no more than 15 classes.

To determine the

width of a class interval,

you divide the

range

(Highest value–Lowest value) of the data by the number of class groupings desired.

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Chap 2-21

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Chap 2-21

Organizing Numerical Data: Frequency Distribution Example

Example: A manufacturer of insulation randomly selects 20 winter days and records the daily high temperature

24, 35, 17, 21, 24, 37, 26, 46, 58, 30, 32, 13, 12, 38, 41, 43, 44, 27, 53, 27

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Chap 2-22

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Chap 2-22

Organizing Numerical Data: Frequency Distribution Example

Sort raw data in ascending order:

12, 13, 17, 21, 24, 24, 26, 27, 27, 30, 32, 35, 37, 38, 41, 43, 44, 46, 53, 58

Find range:

58 - 12 = 46

Select number of classes:

5 (usually between 5 and 15)

Compute class interval (width):

10 (46/5 then round up)

Determine class boundaries (limits):

Class 1: 10 to less than 20

Class 2: 20 to less than 30

Class 3: 30 to less than 40

Class 4: 40 to less than 50

Class 5: 50 to less than 60

Compute class midpoints:

15, 25, 35, 45, 55

Count observations & assign to classes

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Chap 2-23

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Chap 2-23

Organizing Numerical Data: Frequency Distribution Example

Class Midpoints Frequency

10 but less than 20 15 3

20 but less than 30 25 6

30 but less than 40 35 5

40 but less than 50 45 4

50 but less than 60 55 2

Total

20

Data in ordered array:

12, 13, 17, 21, 24, 24, 26, 27, 27, 30, 32, 35, 37, 38, 41, 43, 44, 46, 53, 58

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Chap 2-24

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Chap 2-24

Organizing Numerical Data: Relative & Percent Frequency Distribution Example

Class Frequency

10 but less than 20 3 .15 15

20 but less than 30 6 .30 30

30 but less than 40 5 .25 25

40 but less than 50 4 .20 20

50 but less than 60 2 .10 10

Total

20 1.00 100

Relative

Frequency

Percentage

Data in ordered array:

12, 13, 17, 21, 24, 24, 26, 27, 27, 30, 32, 35, 37, 38, 41, 43, 44, 46, 53, 58

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Chap 2-25

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Chap 2-25

Organizing Numerical Data: Cumulative Frequency Distribution Example

Class

10 but less than 20 3 15% 3 15%

20 but less than 30 6 30% 9 45%

30 but less than 40 5 25% 14 70%

40 but less than 50 4 20% 18 90%

50 but less than 60 2 10% 20 100%

Total 20 100 20 100%

Percentage

Cumulative Percentage

Data in ordered array:

12, 13, 17, 21, 24, 24, 26, 27, 27, 30, 32, 35, 37, 38, 41, 43, 44, 46, 53, 58

Frequency

Cumulative Frequency

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Chap 2-26

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Chap 2-26

Why Use a Frequency Distribution?

It condenses the raw data into a more useful form

It allows for a quick visual interpretation of the data

It enables the determination of the major characteristics of the data set including where the data are concentrated / clustered

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Chap 2-27

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Chap 2-27

Frequency Distributions:Some Tips

Different class boundaries may provide different pictures for the same data (especially for smaller data sets)

Shifts in data concentration may show up when different class boundaries are chosen

As the size of the data set increases, the impact of alterations in the selection of class boundaries is greatly reduced

When comparing two or more groups with different sample sizes, you must use either a relative frequency or a percentage distribution

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Chap 2-28

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Visualizing Categorical Data Through Graphical Displays

Chap 2-28

Categorical Data

Visualizing Data

Bar

Chart

Summary Table For One Variable

Contingency Table For Two Variables

Side-By-Side Bar Chart

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Pie Chart

Pareto

ChartSlide29

Chap 2-29

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Chap 2-29

Visualizing Categorical Data: The Bar Chart

In a

bar chart,

a bar shows each category, the length of which represents the amount, frequency or percentage of values falling into a category which come from the summary table of the variable.

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A

Banking Preference?

%

ATM

16%

Automated or live telephone

2%

Drive-through service at branch

17%

In person at branch

41%

Internet

24%Slide30

Chap 2-30

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-30

Visualizing Categorical Data: The Pie Chart

The

pie chart

is a circle broken up into slices that represent categories. The size of each slice of the pie varies according to the percentage in each category.

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A

Banking Preference?

%

ATM

16%

Automated or live telephone

2%

Drive-through service at branch

17%

In person at branch

41%

Internet

24%Slide31

Chap 2-31

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Chap 2-31

Visualizing Categorical Data:The Pareto Chart

Used to portray categorical data (nominal scale)

A vertical bar chart, where categories are shown in descending order of frequency

A cumulative polygon is shown in the same graph

Used to separate the “vital few” from the “trivial many”

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Chap 2-32

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Chap 2-32

Visualizing Categorical Data:The Pareto Chart (con’t)

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Chap 2-33

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Visualizing Categorical Data:Side-By-Side Bar Charts

Chap 2-33

The

side by side bar chart

represents the data from a contingency table.

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A

Invoices with errors are much more likely to be of

medium size (61.54% vs 30.77% and 7.69%)

No

Errors

Errors

Total

Small

Amount

50.75%

30.77%

47.50%

Medium

Amount

29.85%

61.54%

35.00%

Large

Amount

19.40%

7.69%

17.50%

Total

100.0%

100.0%

100.0%Slide34

Chap 2-34

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-34

Visualizing Numerical Data By Using Graphical Displays

Numerical Data

Ordered Array

Stem-and-Leaf

Display

Histogram

Polygon

Ogive

Frequency Distributions and

Cumulative Distributions

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Chap 2-35

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Chap 2-35

Stem-and-Leaf Display

A simple way to see how the data are distributed and where concentrations of data exist

METHOD: Separate the sorted data series

into leading digits (the

stems

) and

the trailing digits (the

leaves

)

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Chap 2-36

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Chap 2-36

Organizing Numerical Data: Stem and Leaf Display

A

stem-and-leaf display

organizes data into groups (called stems) so that the values within each group (the leaves) branch out to the right on each row.

Stem

Leaf

1

67788899

2

0012257

3

28

4

2

Age of College Students

Day Students Night Students

Stem

Leaf

1

8899

2

0138

3

23

4

15

Age of Surveyed College Students

Day Students

16

17

17

18

18

18

19

19

20

20

21

22

22

25

27

32

38

42

Night Students

18

18

19

19

20

21

23

28

32

33

41

45

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Chap 2-37

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-37

Visualizing Numerical Data: The Histogram

A vertical bar chart of the data in a frequency distribution is called a

histogram.

In a histogram there are no gaps between adjacent bars.

The

class boundaries

(or

class midpoints

) are shown on the horizontal axis.

The vertical axis is either

frequency, relative frequency,

or

percentage

.

The height of the bars represent the frequency, relative frequency, or percentage.

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Chap 2-38

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Chap 2-38

Visualizing Numerical Data: The Histogram

Class Frequency

10 but less than 20 3 .15 15

20 but less than 30 6 .30 30

30 but less than 40 5 .25 25

40 but less than 50 4 .20 20

50 but less than 60 2 .10 10

Total

20 1.00 100

Relative

Frequency

Percentage

(In a percentage histogram the vertical axis would be defined to show the percentage of observations per class)

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Chap 2-39

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-39

Visualizing Numerical Data: The Polygon

A

percentage polygon

is formed by having the midpoint of each class represent the data in that class and then connecting the sequence of midpoints at their respective class percentages.

The

cumulative percentage polygon,

or

ogive,

displays the variable of interest along the

X

axis, and the cumulative percentages along the

Y

axis.

Useful when there are two or more groups to compare.

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Chap 2-40

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-40

Visualizing Numerical Data:

The Frequency Polygon

Class Midpoints

Class

10 but less than 20 15 3

20 but less than 30 25 6

30 but less than 40 35 5

40 but less than 50 45 4

50 but less than 60 55 2

Frequency

Class Midpoint

(In a percentage polygon the vertical axis would be defined to show the percentage of observations per class)

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Chap 2-41

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-41

Visualizing Numerical Data: The Ogive (Cumulative % Polygon)

Class

10 but less than 20 10 0

20 but less than 30 20 15

30 but less than 40 30 45

40 but less than 50 40 70

50 but less than 60 50 90

60 but less than 70 60 100

% less

than lower

boundary

Lower class boundary

Lower Class Boundary

(In an ogive the percentage of the observations less than each lower class boundary are plotted versus the lower class boundaries.

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Chap 2-42

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-42

Visualizing Two Numerical Variables: The Scatter Plot

Scatter plots

are used for numerical data consisting of paired observations taken from two numerical variables

One variable is measured on the vertical axis and the other variable is measured on the horizontal axis

Scatter plots are used to examine possible relationships between two numerical variables

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Chap 2-43

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Chap 2-43

Scatter Plot Example

Volume per day

Cost per day

23

125

26

140

29

146

33

160

38

167

42

170

50

188

55

195

60

200

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Chap 2-44

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-44

Visualizing Two Numerical Variables: The Time-Series Plot

Time-series plots

are used to study patterns in the values of a numeric variable over time.

The numeric variable is measured on the vertical axis and the time period is measured on the horizontal axis.

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Chap 2-45

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-45

Time Series Plot Example

Year

Number of Franchises

1996

43

1997

54

1998

60

1999

73

2000

82

2001

95

2002

107

2003

99

2004

95

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Chap 2-46

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Exploring Multidimensional DataCan be used to discover possible patterns and relationships.

Simple applications used to create summary or contingency tablesCan also be used to change and / or add variables to a tableAll of the examples that follow can be created using Sections EG2.3 and EG2.7 or MG2.3 and MG2.7

Chap 2-

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Chap 2-47

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Pivot Table Version of Contingency Table For Bond Data

Chap 2-47

First Six Data Points In The Bond Data Set

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Fund Number

Type

Assets

Fees

Expense Ratio

Return 2009

3-Year Return

5-Year Return

Risk

FN-1

Intermediate Government

7268.1

No

0.45

6.9

6.9

5.5

Below average

FN-2

Intermediate Government

475.1

No

0.50

9.8

7.5

6.1

Below average

FN-3

Intermediate Government

193.0

No

0.71

6.3

7.0

5.6

Average

FN-4

Intermediate Government

18603.5

No

0.13

5.4

6.6

5.5

Average

FN-5

Intermediate Government

142.6

No

0.60

5.9

6.7

5.4

Average

FN-6

Intermediate Government

1401.6

No

0.54

5.7

6.4

6.2

AverageSlide48

Chap 2-48

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Can Easily Convert To An Overall Percentages Table

Chap 2-48

Intermediate government funds are much more

likely to charge a fee.

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Chap 2-49

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Can Easily Add Variables To An Existing Table

Chap 2-49

Is the pattern of risk the same for all combinations of

fund type and fee charge?

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ASlide50

Chap 2-50

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Can Easily Change The Statistic Displayed

Chap 2-50

This table computes the sum of a numerical variable (Assets)

for each of the four groupings and divides by the overall sum

to get the percentages displayed.

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ASlide51

Chap 2-51

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Tables Can Compute & Display Other Descriptive Statistics

Chap 2-51

This table computes and displays averages of 3-year return

for each of the twelve groupings.

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Chap 2-52

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Chap 2-52

Principles of Excellent Graphs

The graph should not distort the data.

The graph should not contain unnecessary adornments (sometimes referred to as chart junk

).

The scale on the vertical axis should begin at zero.

All axes should be properly labeled.

The graph should contain a title.

The simplest possible graph should be used for a given set of data.

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Chap 2-53

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Chap 2-53

Graphical Errors: Chart Junk

1960: $1.00

1970: $1.60

1980: $3.10

1990: $3.80

Minimum Wage

Bad Presentation

Minimum Wage

0

2

4

1960

1970

1980

1990

$

Good Presentation

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Chap 2-54

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-54

Graphical Errors: No Relative Basis

A’s received by students.

A’s received by students.

Bad Presentation

0

200

300

FR

SO

JR

SR

Freq.

10%

30%

FR

SO

JR

SR

FR = Freshmen, SO = Sophomore, JR = Junior, SR = Senior

100

20%

0%

%

Good Presentation

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Chap 2-55

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-55

Graphical Errors: Compressing the Vertical Axis

Good Presentation

Quarterly Sales

Quarterly Sales

Bad Presentation

0

25

50

Q1

Q2

Q3

Q4

$

0

100

200

Q1

Q2

Q3

Q4

$

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Chap 2-56

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-56

Graphical Errors: No Zero Point on the Vertical Axis

Monthly Sales

36

39

42

45

J

F

M

A

M

J

$

Graphing the first six months of sales

Monthly Sales

0

39

42

45

J

F

M

A

M

J

$

36

Good Presentations

Bad Presentation

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Chap 2-57

Copyright ©2012 Pearson Education, Inc. publishing as Prentice Hall

Chap 2-57

Chapter Summary

Discussed sources of data used in business

Organized categorical data using a summary table or a contingency table.

Organized numerical data using an ordered array, a frequency distribution, a relative frequency distribution, a percentage distribution, and a cumulative percentage distribution.

Visualized categorical data using the bar chart, pie chart, and Pareto chart.

Visualized numerical data using the stem-and-leaf display, histogram, percentage polygon, and ogive.

Developed scatter plots and time-series graphs.

Looked at examples of the use of Pivot Tables in Excel for multidimensional data.

Examined the do’s and don'ts of graphically displaying data.

In this chapter, we have