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
A.
It is a desirable situation.
B.
It is an undesirable situation.
C.
The process standard deviation has decreased during the time the last 50 samples were taken.
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jdubiota
4 months, 3 weeks ago