ASQ CQE Exam - Topic 9 Question 24 Discussion
An X-bar chart has shown control for a long time. You see that points for the last 50 samples are all very near the center line on the chart. In fact, they are all within one sigma of the center line. This probably indicates that
C) The process standard deviation has decreased during the time the last 50 samples were taken.
A) It is a desirable situation.
B) It is an undesirable situation.
D) The control charts are incorrectly computed.
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