Guide to Using Excel For Basic Statistical Applications To Accompany Business Statistics: A Decision Making Approach, 5th Ed. Chapter 17: Introduction to Quality and Statistical Process Control By Groebner, Shannon, Fry, & Smith Prentice-Hall Publishing Company Copyright, 2005

Chapter 17 Excel Examples  X-bar and R Charts X-bar and R Charts Cattleman’s Bar and Grill  P Charts P Charts Hilder’s Publishing Company  C Charts C Charts Chandler Tile Company

X-Bar and R Charts - Cattlemen’s Bar and Grill Issue: In order to maintain its reputation excellent food and service. reputation, the owners need to measure product and service quality on a regular basis. In order to maintain its reputation excellent food and service. reputation, the owners need to measure product and service quality on a regular basis.Objective: Use Excel to develop a procedure to visually monitor key measures of product and service quality. Data file is Cattleman.xls

Open File Cattleman.xls X-Bar and R Charts – Cattleman’s Bar and Grill

Use formulas to determine the Mean and Range of the sample values. The formula for the Range is shown. The formula for the Mean is Average(B2:E2). X-Bar and R Charts – Cattleman’s Bar and Grill

Click on PHStat, then select Control Charts and R & Xbar Charts. X-Bar and R Charts – Cattleman’s Bar and Grill

Enter the Subgroup Size and the cells that contain the range values. Select R and Xbar Charts and enter the range of cells that contain the mean values. Click OK. X-Bar and R Charts – Cattleman’s Bar and Grill

The Xbar Chart is automatically formed. X-Bar and R Charts – Cattleman’s Bar and Grill

The R Chart is also automatically formed. X-Bar and R Charts – Cattleman’s Bar and Grill

P Charts - Hilder Publishing Company Issue: The manager of the order entry department has decided to develop a process control chart to monitor the order entry errors. Objective: Use Excel to develop a procedure to visually monitor order entry form error percentage. Data file is Hilders.xls Use Excel to develop a procedure to visually monitor order entry form error percentage. Data file is Hilders.xls

Open File Hilders.xls P Charts – Hilders Publishing Company

Click on PHStat, then Control Charts then p Chart P Charts – Hilders Publishing Company

Identify the Data ranges and the sample size. P Charts – Hilders Publishing Company

PHStat constructs the p Chart. P Charts – Hilders Publishing Company

c Charts - Chandler Tile Company Issue: The company wants to develop a procedure to monitor the number of defects in its production of tiles. Objective: Use Excel to develop a procedure to visually monitor order surface scratches in tile. Data file is Chandler.xls Use Excel to develop a procedure to visually monitor order surface scratches in tile. Data file is Chandler.xls

Open File Chandler.xls c-Charts – Chandler Tile Company

Use this formula to find the average number of scratches in the data. c-Charts – Chandler Tile Company

Copy 5.7 into the 40 cells. c-Charts – Chandler Tile Company

Use this formula to determine the Upper Control Limit and copy the value into the 40 cells c-Charts – Chandler Tile Company

Use this formula to find the Lower Control Limit. Since the value is negative, copy 0 into the 40 cells. c-Charts – Chandler Tile Company

To construct the control chart, click on the Chart Wizard and select Line. c-Charts – Chandler Tile Company

Click on Series. Then identify series name and range for each set of values needed in the chart. c-Charts – Chandler Tile Company

Label the chart and the X and Y axis. c-Charts – Chandler Tile Company

Left click on any point on the graph then right click. Format the lines as desired. c-Charts – Chandler Tile Company