The operations manager of a large manufacturer received a certain number of complaints during the last two

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The operations manager of a large manufacturer received a certain number of complaints during the last two weeks.

a. Construct a control chart with Three Sigma limits for the number of complaints received each day using the following data. Is the process in control?

b. If 16 complaints are received today (day 15), using the control chart of part a, is there a change in the average number of complaints per day?

Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Number of complaints 4 10 14 8 9 6 5 12 13 7 6 4 2 10

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Operations Management

ISBN: 9781259270154

6th Canadian Edition

Authors: William J Stevenson, Mehran Hojati, James Cao

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