In an effort to reduce customer dissatisfaction with delays in replacing lost automated teller machine (ATM) cards,
Question:
a. Construct an R-chart for these data.
b. What does the R-chart suggest about the presence of special causes of variation in the process?
c. Should the control limits of your R-chart be used to monitor future replacement cycle times? Explain.
d. Given your conclusion in part b and the pattern displayed on the R-chart, discuss the possible future impact on the performance of the bank.
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Related Book For
Statistics For Business And Economics
ISBN: 9780134506593
13th Edition
Authors: James T. McClave, P. George Benson, Terry Sincich
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