Managing for Quality and Performance Excellence 10th Edition by James Evans ,William Lindsay

Exercise 91

Note: Data for many of the problems in this chapter can be found in the Excel workbook C08Data.xlsx on the Student Companion Site. Click on the appropriate worksheet tab as noted in the problem (e.g., Prob. 8-6, etc.) to access the data.
An injection molding machine at the Moby Molding Co. used to make plastic bottles has four molding heads. The outside diameter of the bottle is an important measure of process performance. The table in the worksheet Prob. 8-36 in the C08Data.xlsx file shows the results of 30 samples in which the data are coded by subtracting the actual value from the nominal dimension. Construct
and s -charts charts and discuss the results.