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Guide to Using Minitab For Basic Statistical Applications To Accompany Business Statistics: A Decision Making Approach, 6th Ed. Chapter 2: Graphs, Charts and Tables - Describing Your Data By Groebner, Shannon, Fry, & Smith Prentice-Hall Publishing Company Copyright, 2005

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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

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

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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

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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

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Frequency Distributions-Athletic Shoe Survey Select Stat the select Tables then Tally

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Frequency Distributions-Athletic Shoe Survey Select Number of Nike variable – Display Counts

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Frequency Distributions-Athletic Shoe Survey Resulting Frequency Counts

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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

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

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To determine class width, find minimum and maximum balances Select Calc and Column Statistics Histograms-Capital Credit Union

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Use Minitab Minimum option to determine smallest value Histograms-Capital Credit Union

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Minimum value = $99.00 Histograms-Capital Credit Union

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Use Calc and Column Statistics – Maximum to get the largest account balance = $1,493.00 Histograms-Capital Credit Union

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Compute Class Width Round Up to $150.00 $90 to less than $240 $240 to less than $390 Class Intervals $390 to less than $540 etc…. Histograms-Capital Credit Union

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Construct cutpoint column Histograms-Capital Credit Union

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Select Graph - Histogram Histograms-Capital Credit Union

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Select Credit Card Account Balance variable then options Histograms-Capital Credit Union

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Select the Frequency type Use CutPoint type of interval Enter cutpoints column. Histograms-Capital Credit Union

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Use Edit Attributes to set type of bar and color. Histograms-Capital Credit Union

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Completed Histogram Histograms-Capital Credit Union

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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

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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

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First, organize the Credit balances into groups (see Example 2-5) Select Manip – Code – Numeric to Numeric Joint Frequency Distributions-Capital Credit Union

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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

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To create the joint frequency table, use Stat – Tables – Cross Tabulation Joint Frequency Distributions-Capital Credit Union

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Define variables to used (Credit Card Balances and Gender) Click Counts Joint Frequency Distributions-Capital Credit Union

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Completed Joint Relative Frequency Distribution (Label rows as desired). Joint Frequency Distributions-Capital Credit Union

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

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Joint Relative Frequencies-Capital Credit Union Select Stat – Tables – Cross Tabulation

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Define variables to used (Credit Card Balances and Gender) Click total percents Joint Frequency Distributions-Capital Credit Union

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Completed Joint Relative Frequency Distribution (Label rows as desired Joint Relative Frequencies-Capital Credit Union

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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

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

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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

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Use the Manip – Stack option to construct three new variables, Year, Starting Salary and Gender. Bar Charts-Bach, Lombard & Wilson

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Three new variables, Year, Starting Salary and Gender. Bar Charts-Bach, Lombard & Wilson

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Select Graph - Chart Bar Charts-Bach, Lombard & Wilson

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Select Year, C14, for X variable Choose: For each - Group and Group variables - Gender Select Starting Salary, C15, for Y variable Bar Charts-Bach, Lombard & Wilson

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Use Edit Attributes to set Back Color and Fill Type Bar Charts-Bach, Lombard & Wilson

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Bar Chart for Starting Salaries Bar Charts-Bach, Lombard & Wilson

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Bar Charts- Bach, Lombard, & Wilson (continued) 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 percent of males and females hired with MBAs. Data File is Bach.mtw

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Open File Bach.mtw Bar Charts-Bach, Lombard & Wilson

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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

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Use the Manip – Stack option to construct three new variables, Year, Percent with MBA, and Gender. Bar Charts-Bach, Lombard & Wilson

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Three new variables, Year, Percent with MBA and Gender. Bar Charts-Bach, Lombard & Wilson

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Select Graph - Chart

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Select Year, C14, for X variable Choose: For each - Group and Group variables - Gender Select Percent with MBA, C15, for Y variable Bar Charts-Bach, Lombard & Wilson

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Use Edit Attributes to set Back Color and Fill Type Bar Charts-Bach, Lombard & Wilson

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Bar Chart for Percent with MBA Degrees Bar Charts-Bach, Lombard & Wilson

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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

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

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Select Time Series Plot. Click on Graph Line Charts-McGregor Vineyards

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Select Variable (Sales) to be graphed as Y Variable Set Display to Symbol and Connect Click on Time Scale - Index Line Charts-McGregor Vineyards

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Use Edit Attributes to indicate type of Markers (Solid Circle), Color (Blue) and Size (2.0) Line Charts-McGregor Vineyards

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Use Annotation to Add Titles, etc. to chart Line Charts-McGregor Vineyards

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Enter Desired Title and Define Font, etc. Line Charts-McGregor Vineyards

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Finished Line Chart for Sales – Now repeat the process for the Profit Variable. Line Charts-McGregor Vineyards

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Next, graph both variables on the same page Select Graph – Layout Then enter Titles etc. Line Charts-McGregor Vineyards

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Information entered here will apply to the page. Line Charts-McGregor Vineyards

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Select Graph- Time Series Plot Line Charts-McGregor Vineyards

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Create Sales Graph as before Line Charts-McGregor Vineyards

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To set up first graph on page, use Regions - Figure Line Charts-McGregor Vineyards

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Define location of first graph Line Charts-McGregor Vineyards

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Now create the Profit graph. Use Graph – Time Series and select Profit as Y variable Line Charts-McGregor Vineyards

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Next, use Regions – Figures and Define position within page for the Profit graph Line Charts-McGregor Vineyards

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Select Graph – End Layout Line Charts-McGregor Vineyards

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Completed Line Charts Line Charts-McGregor Vineyards

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Select Time Series Plot. Click on Graph Line Charts-McGregor Vineyards

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Select Sales and Profit as the Y variables. Click on Frame Click on Time Scale - Index Line Charts-McGregor Vineyards

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Select Multiple Graphs Line Charts-McGregor Vineyards

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Select Overlay on same page. Line Charts-McGregor Vineyards

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Completed Line Charts Line Charts-McGregor Vineyards

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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

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Scatter Diagrams- Personal Computers Open the Minitab file called Computers.mtw File contains data for 36 PCs

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Click on the Graph, select Character Graphs and then Scatter plot Scatter Diagrams- Personal Computers

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In Y enter Price, in X enter Processor Speed, then click OK. Scatter Diagrams- Personal Computers

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Completed Scatter Diagram Scatter Diagrams- Personal Computers

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