Consider the data on the waiting time (seconds) of customers before speaking to a representative at a
Question:
(a) Construct an individuals and moving-range chart, and comment on the process.
(b) Construct a moving-average chart, with a window of 3, and comment on the process.
(c) Construct an exponentially weighted moving-average chart, with a weighting factor of 0.2, and comment on the process.
(d) Construct a cumulative sum chart, with a target value of 30 seconds, and comment on the process. Assume a type I error level of 0.05.
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Related Book For
Fundamentals of quality control and improvement
ISBN: 978-0470226537
3rd edition
Authors: amitava mitra
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