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

Exercise 4

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.
Twenty-five samples of size 4 resulted in statistics of
= 38.0 minutes and
= 3.0 minutes for the Turkmaster Cleaning Company's average time to completely clean a rug. Compute control limits for
and R -charts and estimate the standard deviation of the process.