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

Exercise 24

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.
In testing the temperature in an analysis process in Hermitage DNA Labs, LLC, containing both positive and negative values, the data listed in the worksheet Prob. 8-28 in the C08Data.xIsx file on the Student Companion Site for this chapter were obtained.
a. Compute the mean, standard deviation and other descriptive statistics for the data.
b. Construct
and R -charts for these data. Determine whether the process is in control. If not, eliminate any assignable causes and compute revised limits.