Question: After a control chart (for means) has been developed, samples are taken and the average is computed for each sample. The process could be considered

After a control chart (for means) has been developed, samples are taken and the average is computed for each sample. The process could be considered out of control if

a. one of the sample means is above the upper control limit.

b. one of the sample means is below the lower control limit.

c. five consecutive sample means show a consistent trend

(either increasing or decreasing).

d. all of the above were true.

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