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

Exercise 77

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.
Birdseye Magnetronics makes induction meters used in vending machines to test the validity of coins. Their specifications require the induction reading capability of the meters to fall between 0.25 and 0.50 Tesla (T) units. Quality analysts took 3 random test readings of 30 meters, as found in the worksheet Prob. 8-24 in the C08Data.xlsx file.
a. Using Microsoft Excel ® or similar software with statistical capability, construct a histogram for these 90 individual readings.
b. Construct a run chart for the sample means.
c. Interpret what the data show. Does the process appear to be in control?