guide to using minitab for basic statistical applications to accompany business statistics: a...

Guide to Using Minitab For Basic Statistical Applications

To AccompanyTo Accompany

Business Statistics: A Decision Making Approach, 6th Ed.

Chapter 2:Chapter 2:

Graphs, Charts and Tables - Describing Graphs, Charts and Tables - Describing Your DataYour Data

Groebner, Shannon, Fry, & SmithGroebner, Shannon, Fry, & SmithPrentice-Hall Publishing CompanyPrentice-Hall Publishing Company

Copyright, 2005Copyright, 2005

Chapter 2 Minitab Examples Frequency Distributions -

Athletic Shoe Survey Histograms-

Capital Credit Union Joint Frequency Distributions-

Capital Credit Union Joint Relative Frequencies-

Capital Credit Union

More Examples

Chapter 2 Minitab Examples (continued)Chapter 2 Minitab Examples (continued)

Bar Charts-

Bach, Lombard & Wilson Line Charts-

McGregor Vineyards Scatter Diagrams-

Personal Computers

Frequency Distributions Athletic Shoe SurveyFrequency Distributions Athletic Shoe Survey

Issue: Issue:

Analyze the data from a survey of 100 Analyze the data from a survey of 100 college students regarding the number of Nike college students regarding the number of Nike shoes they own.shoes they own.

Objective: Objective:

Use Minitab to develop a frequency Use Minitab to develop a frequency distribution for the number of Nike shoes owned distribution for the number of Nike shoes owned by college students. Data File is by college students. Data File is SportShoes.mtwSportShoes.mtw

Frequency Distributions-Athletic Shoe Survey

Open the Minitab file called Sportshoes.mtw

File contains 100 observations - Column C5 contains the Number of Nike Shoes owned

Select Stat the select Tables then Tally

Select “Number of Nike” variable – Display Counts

Resulting Frequency Counts

HistogramsCapital Credit UnionHistogramsCapital Credit Union

Issue: Issue:

Analyze credit card balances for Capital Analyze credit card balances for Capital Credit Union customers using a frequency Credit Union customers using a frequency distribution and histogram.distribution and histogram.

Use Minitab to develop a frequency Use Minitab to develop a frequency distribution and histogram for credit card distribution and histogram for credit card balances. Use ten class intervals. Data file is balances. Use ten class intervals. Data file is Capital.mtwCapital.mtw

Histograms-Capital Credit Union

Open the Minitab file called Capital.mtw

File contains 300 observations - Column C2 contains the balances

To determine class width, find minimum and maximum balances

Select Calc and Column Statistics

Use Minitab Minimum option to determine smallest value

Minimum value = $99.00

Use Calc and Column Statistics – Maximum to get the largest account balance = $1,493.00

Compute Class Width

Round Up to $150.00

139.410

99.001493.00 w

$90 to less than $240 $240 to less than $390 Class Intervals$390 to less than $540

etc….

Construct cutpoint column

Select Graph - Histogram

Select Credit Card Account Balance variable then options

Select the Frequency type Use CutPoint type

of interval

Enter cutpoints column.

Use Edit Attributes to set type of bar and color.

Completed Histogram

Joint Frequency Distributions Capital Credit UnionJoint Frequency Distributions Capital Credit Union

Issue: Issue:

Analyze the credit card balances by Analyze the credit card balances by gender of the card holder.gender of the card holder.

Use Minitab to develop a joint frequency Use Minitab to develop a joint frequency distribution for the credit card balances by distribution for the credit card balances by gender. Data File is gender. Data File is Capital.mtwCapital.mtw

Joint Frequency Distributions-Capital Credit Union

Open the Minitab file called Capital.mtw

File contains 300 observations - Column C2 contains the balances, Column C3 contains the gender code

First, organize the Credit balances into groups (see Example 2-5)

Select Manip – Code – Numeric to Numeric

Minitab allows only 8 groups – Need to recode twice.

Identify variable to be Recoded – indicate where to store new variable

To create the joint frequency table, use Stat – Tables – Cross Tabulation

Define variables to used (Credit Card Balances and Gender)

Click Counts

Completed Joint Relative Frequency Distribution (Label rows as desired).

Use Minitab to develop a Use Minitab to develop a joint relative joint relative frequencyfrequency distribution for the credit card balances distribution for the credit card balances by gender. Data File is by gender. Data File is Capital.mtw Capital.mtw

Joint Relative Frequencies Capital Credit Union

Joint Relative Frequencies-Capital Credit Union

Select Stat – Tables – Cross Tabulation

Define variables to used (Credit Card Balances and Gender)

Click total percents

Completed Joint Relative Frequency Distribution (Label rows as desired

Joint Relative Frequencies-Capital Credit Union

Bar ChartsBach, Lombard, & Wilson

Issue: Issue:

An electronics company is being sued on An electronics company is being sued on the grounds that female new hires are paid less the grounds that female new hires are paid less than male new hires. The law firm needs to than male new hires. The law firm needs to analyze salary data to prepare the case.analyze salary data to prepare the case.

Use Minitab to develop bar charts for the Use Minitab to develop bar charts for the starting salary data for males and females. Data starting salary data for males and females. Data File is File is Bach.mtwBach.mtw

Bar Charts-Bach, Lombard & Wilson

Open the Minitab file called Bach.mtw

To construct the bar chart, the stack option must be used. Start by adding the Year M, Year F, Male and Female columns.

Use the Manip – Stack option to construct three new variables, Year, Starting Salary and Gender.

Three new variables, Year, Starting Salary and Gender.

Select Graph - Chart

Select Year, C14, for X variableChoose: For each

- Group and Group variables - Gender

Select Starting Salary, C15, for Y variable

Use Edit Attributes to set Back Color and Fill Type

Bar Chart for Starting Salaries

Bar Charts-Bach, Lombard, & Wilson (continued)

Issue: Issue:

An electronics company is being sued on An electronics company is being sued on the grounds that female new hires are paid less the grounds that female new hires are paid less than male new hires. The law firm needs to than male new hires. The law firm needs to analyze salary data to prepare the case.analyze salary data to prepare the case.

Use Minitab to develop bar charts for the Use Minitab to develop bar charts for the percent of males and females hired with MBA’s.percent of males and females hired with MBA’s. Data File is Data File is Bach.mtwBach.mtw

Open File Bach.mtw

To construct the bar chart, the stack option must be used. Start by adding the Year M, Year F, Male and Female columns.

Use the Manip – Stack option to construct three new variables, Year, Percent with MBA, and Gender.

Three new variables, Year, Percent with MBA and Gender.

Select Graph - Chart

Select Year, C14, for X variableChoose: For each

- Group and Group variables - Gender

Select Percent with MBA, C15, for Y variable

Use Edit Attributes to set Back Color and Fill Type

Bar Chart for Percent with MBA Degrees

Line Charts- McGregor VineyardsLine Charts- McGregor Vineyards

Issue: Issue:

Analyze the sales and profits data over Analyze the sales and profits data over time.time.

Use Minitab to develop line charts for Use Minitab to develop line charts for weekly sales and profits. Data File is weekly sales and profits. Data File is McGregor.mtwMcGregor.mtw

Line Charts-McGregor Vineyards

Open the Minitab file called McGregor.mtw

File contains 20 weeks of historical data

Select Time Series Plot.

Click on Graph

Select Variable (Sales) to be graphed as Y Variable

Set Display to Symbol and Connect

Click on Time Scale - Index

Use Edit Attributes to indicate type of Markers (Solid Circle), Color (Blue) and Size (2.0)

Use Annotation to Add Titles, etc. to chart

Enter Desired Title and Define Font, etc.

Finished Line Chart for Sales – Now repeat the process for the Profit Variable.

Next, graph both variables on the same page

Select Graph – Layout

Then enter Titles etc.

Information entered here will apply to the page.

Select Graph- Time Series Plot

Create Sales Graph as before

To set up first graph on page, use Regions - Figure

Define location of first graph

Now create the Profit graph. Use Graph – Time Series and select Profit as Y variable

Next, use Regions – Figures and Define position within page for the Profit graph

Select Graph – End Layout

Completed Line Charts

Select Time Series Plot.

Click on Graph

Select Sales and Profit as the Y variables.

Click on Frame

Click on Time Scale - Index

Select Multiple Graphs

Select Overlay on same page.

Completed Line Charts

Scatter Diagrams- Personal ComputersScatter Diagrams- Personal Computers

Issue: Issue:

Analyze the relationship between PC sales Analyze the relationship between PC sales price and the processing speed of the PCprice and the processing speed of the PC

Use Minitab to develop a scatter diagram Use Minitab to develop a scatter diagram for PC price and speed. Data File is for PC price and speed. Data File is Computers.mtwComputers.mtw

Scatter Diagrams- Personal Computers

Open the Minitab file called Computers.mtw

File contains data for 36 PC’s

Click on the Graph, select Character Graphs and then Scatter plot

In Y enter Price, in X enter Processor Speed, then click OK.

Completed Scatter Diagram

guide to using minitab for basic statistical applications to accompany business statistics: a...

credit balances

capital credit union

frequency counts slide

credit card balances

joint frequency table

gender code slide

minitab file

data file

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