Guide to Using Minitab 14 For Basic Statistical Applications

Guide to Using Minitab 14 For Basic Statistical Applications
To Accompany Business Statistics: A Decision Making Approach, 7th Ed. Chapter 2: Graphs, Charts and Tables - Describing Your Data By Groebner, Shannon, Fry, & Smith Prentice-Hall Publishing Company Copyright, 2008

Chapter 2 Minitab Examples
Frequency Distributions - Athletic Shoe Survey Histograms- Capital Credit Union Joint Frequency Distributions- Joint Relative Frequencies- More Examples

Chapter 2 Minitab Examples (continued)
Bar Charts- Bach, Lombard & Wilson Line Charts- McGregor Vineyards Scatter Diagrams- Personal Computers

Frequency Distributions Athletic Shoe Survey
Issue: Analyze the data from a survey of 100 college students regarding the number of Nike shoes they own. Objective: Use Minitab to develop a frequency distribution for the number of Nike shoes owned by college students. Data File is SportShoes.MTW

Frequency Distributions-Athletic Shoe Survey
Open the Minitab file called Sportshoes.MTW The file contains 100 observations. Column C5 contains the Number of Nike Shoes owned

Select Stat then select Tables then Tally Individual Variables

Select “Number of Nike” variable – Display Counts – OK

Resulting Frequency Counts

Histograms Capital Credit Union
Issue: Analyze credit card balances for Capital Credit Union customers using a frequency distribution and histogram. Objective: Use Minitab to develop a frequency distribution and histogram for credit card balances. Use ten class intervals. Data file is Capital.MTW

Histograms-Capital Credit Union
Open the Minitab file called Capital.MTW File contains 300 observations - Column C2 contains the balances

Select Graph and Histogram

Click Simple - OK

Select variable to be graphed - OK

Completed Histogram

Joint Frequency Distributions Capital Credit Union
Issue: Analyze the credit card balances by gender of the card holder. Objective: Use Minitab to develop a joint frequency distribution for the credit card balances by gender. Data File is Capital.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 Data – Code – Numeric to Text

Minitab only codes 8 classes at a time. Code the first 8 classes; then code the remaining classes Identify variable to be Recoded – indicate where to store new variable Click OK

To create the joint frequency table, use Stat – Tables – Cross Tabulation and Chi-square

Define variables to be uses (Classes and Gender) Click Column Percents - OK

Completed Joint Frequency Distribution

Joint Relative Frequencies Capital Credit Union
Objective: Use Minitab to develop a joint relative frequency distribution for the credit card balances by gender. Data File is Capital.MTW

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 Data – Code – Numeric to Text

Minitab can only code 8 groups at a time. So if you had a distribution with, say 12 classes, you would code the first 8 classes (groups) and then code the next 4 classes Identify variable to be Recoded – indicate where to store new variable, Click OK

To create the joint frequency table, use Stat – Tables – Cross Tabulation and Chi-square

Define variables to used (Classes and Gender). Click OK

Joint Relative Frequencies-Capital Credit Union
Completed Joint Relative Frequency Distribution

Bar Charts Bach, Lombard, & Wilson
Issue: An electronics company is being sued on the grounds that female new hires are paid less than male new hires. The law firm needs to analyze salary data to prepare the case. Objective: Use Minitab to develop bar charts for the starting salary data for males and females. Data File is Bach.MTW

Bar Charts-Bach, Lombard & Wilson
Open the Minitab file called Bach.MTW

Must Rearrange the data. Select Data - Stack - Columns

Select Variables – Identify New Column Name – and Column for category labels - OK

Stack the Year variable - OK

Select Graph – Bar Chart

Under Bars represent – Select Values from a table - OK

Select Cluster – Click OK

Define Variable to Graph and Categories - OK

Finished Bar Chart 1= Males, 2 = Females

Line Charts- McGregor Vineyards
Issue: Analyze the sales and profits data over time. Objective: Use Minitab to develop line charts for weekly sales and profits. Data File is McGregor.MTW

Line Charts-McGregor Vineyards
Open the Minitab file called McGregor.MTW File contains 20 weeks of historic data

Click on Graph Select Time Series Plot.

Select Simple - OK

Define Variables to be Graphed – Select Multiple Graphs

Define Output Option – Click OK - OK

Finished Line Chart for the Sales and the Profit Variables.

Scatter Diagrams- Personal Computers
Issue: Analyze the relationship between PC sales price and the processing speed of the PC Objective: Use Minitab to develop a scatter diagram for PC price and speed. Data File is Computers.MTW

Open the Minitab file called Computers.MTW File contains data for 36 PC’s

Click on the Graph, select Scatter plot

Select Simple – Click OK

Define the Y and X variables Click OK

Completed Scatter Diagram

Guide to Using Minitab 14 For Basic Statistical Applications

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