The number of influenza patients (in thousands) visiting hospitals weekly is shown in the following table. Suppose

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The number of influenza patients (in thousands) visiting hospitals weekly is shown in the following table. Suppose that the standard deviation is σ = 2 and the target value is 160.


Number of Sample Number of Patients Sample Patients 162.27 1 13 159.989 157.47 14 159.09 3 157.065 15 162.699 160.45 16


(a) Design a CUSUM scheme for the process. Does the process appear to be in control at the target?

(b) How many samples on average would be required to detect a shift of the mean to 165?

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Applied Statistics And Probability For Engineers

ISBN: 9781118539712

6th Edition

Authors: Douglas C. Montgomery, George C. Runger

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