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Guide to Using Minitab For Basic Statistical Applications
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
ByBy
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
Frequency Distributions-Athletic Shoe Survey
Select Stat the select Tables then Tally
Frequency Distributions-Athletic Shoe Survey
Select “Number of Nike” variable – Display Counts
Frequency Distributions-Athletic Shoe Survey
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.
Objective: Objective:
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
Histograms-Capital Credit Union
Use Minitab Minimum option to determine smallest value
Histograms-Capital Credit Union
Minimum value = $99.00
Histograms-Capital Credit Union
Use Calc and Column Statistics – Maximum to get the largest account balance = $1,493.00
Histograms-Capital Credit Union
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….
Histograms-Capital Credit Union
Construct cutpoint column
Histograms-Capital Credit Union
Select Graph - Histogram
Histograms-Capital Credit Union
Select Credit Card Account Balance variable then options
Histograms-Capital Credit Union
Select the Frequency type Use CutPoint type
of interval
Enter cutpoints column.
Histograms-Capital Credit Union
Use Edit Attributes to set type of bar and color.
Histograms-Capital Credit Union
Completed Histogram
Histograms-Capital Credit Union
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.
Objective: Objective:
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
Joint Frequency Distributions-Capital Credit Union
Minitab allows only 8 groups – Need to recode twice.
Identify variable to be Recoded – indicate where to store new variable
Joint Frequency Distributions-Capital Credit Union
To create the joint frequency table, use Stat – Tables – Cross Tabulation
Joint Frequency Distributions-Capital Credit Union
Define variables to used (Credit Card Balances and Gender)
Click Counts
Joint Frequency Distributions-Capital Credit Union
Completed Joint Relative Frequency Distribution (Label rows as desired).
Joint Frequency Distributions-Capital Credit Union
Objective: Objective:
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
Joint Frequency Distributions-Capital Credit Union
Completed Joint Relative Frequency Distribution (Label rows as desired
Joint Relative Frequencies-Capital Credit Union
Bar ChartsBach, Lombard, & Wilson
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.
Objective: Objective:
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.
Bar Charts-Bach, Lombard & Wilson
Use the Manip – Stack option to construct three new variables, Year, Starting Salary and Gender.
Bar Charts-Bach, Lombard & Wilson
Three new variables, Year, Starting Salary and Gender.
Bar Charts-Bach, Lombard & Wilson
Select Graph - Chart
Bar Charts-Bach, Lombard & Wilson
Select Year, C14, for X variableChoose: For each
- Group and Group variables - Gender
Select Starting Salary, C15, for Y variable
Bar Charts-Bach, Lombard & Wilson
Use Edit Attributes to set Back Color and Fill Type
Bar Charts-Bach, Lombard & Wilson
Bar Chart for Starting Salaries
Bar Charts-Bach, Lombard & Wilson
Bar Charts-Bach, Lombard, & Wilson (continued)
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.
Objective: Objective:
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
Bar Charts-Bach, Lombard & Wilson
To construct the bar chart, the stack option must be used. Start by adding the Year M, Year F, Male and Female columns.
Bar Charts-Bach, Lombard & Wilson
Use the Manip – Stack option to construct three new variables, Year, Percent with MBA, and Gender.
Bar Charts-Bach, Lombard & Wilson
Three new variables, Year, Percent with MBA and Gender.
Bar Charts-Bach, Lombard & Wilson
Bar Charts-Bach, Lombard & Wilson
Select Graph - Chart
Select Year, C14, for X variableChoose: For each
- Group and Group variables - Gender
Select Percent with MBA, C15, for Y variable
Bar Charts-Bach, Lombard & Wilson
Use Edit Attributes to set Back Color and Fill Type
Bar Charts-Bach, Lombard & Wilson
Bar Chart for Percent with MBA Degrees
Bar Charts-Bach, Lombard & Wilson
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.
Objective: Objective:
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
Line Charts-McGregor Vineyards
Select Variable (Sales) to be graphed as Y Variable
Set Display to Symbol and Connect
Click on Time Scale - Index
Line Charts-McGregor Vineyards
Use Edit Attributes to indicate type of Markers (Solid Circle), Color (Blue) and Size (2.0)
Line Charts-McGregor Vineyards
Use Annotation to Add Titles, etc. to chart
Line Charts-McGregor Vineyards
Enter Desired Title and Define Font, etc.
Line Charts-McGregor Vineyards
Finished Line Chart for Sales – Now repeat the process for the Profit Variable.
Line Charts-McGregor Vineyards
Next, graph both variables on the same page
Select Graph – Layout
Then enter Titles etc.
Line Charts-McGregor Vineyards
Information entered here will apply to the page.
Line Charts-McGregor Vineyards
Select Graph- Time Series Plot
Line Charts-McGregor Vineyards
Create Sales Graph as before
Line Charts-McGregor Vineyards
To set up first graph on page, use Regions - Figure
Line Charts-McGregor Vineyards
Define location of first graph
Line Charts-McGregor Vineyards
Now create the Profit graph. Use Graph – Time Series and select Profit as Y variable
Line Charts-McGregor Vineyards
Next, use Regions – Figures and Define position within page for the Profit graph
Line Charts-McGregor Vineyards
Select Graph – End Layout
Line Charts-McGregor Vineyards
Completed Line Charts
Line Charts-McGregor Vineyards
Select Time Series Plot.
Click on Graph
Line Charts-McGregor Vineyards
Select Sales and Profit as the Y variables.
Click on Frame
Click on Time Scale - Index
Line Charts-McGregor Vineyards
Select Multiple Graphs
Line Charts-McGregor Vineyards
Select Overlay on same page.
Line Charts-McGregor Vineyards
Completed Line Charts
Line Charts-McGregor Vineyards
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
Objective: Objective:
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
Scatter Diagrams- Personal Computers
In Y enter Price, in X enter Processor Speed, then click OK.
Scatter Diagrams- Personal Computers
Completed Scatter Diagram
Scatter Diagrams- Personal Computers