Managing for Quality and Performance Excellence 9th Edition by James Evans,William Lindsay

Exercise 54

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.
For each of the control charts in Figure 8.56, assume that the process has been operating in statistical control for some time. What conclusions should the operators reach at this point?