ASQ
CQE · Question #90
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…
The correct answer is C. The process standard deviation has decreased during the time the last 50 samples were. See the full explanation below for the reasoning.
Statistical Tools and Techniques
Question
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
Options
- AIt is a desirable situation.
- BIt is an undesirable situation.
- CThe process standard deviation has decreased during the time the last 50 samples were
- DThe control charts are incorrectly computed.
How the community answered
(31 responses)- A3% (1)
- B3% (1)
- C84% (26)
- D10% (3)
Topics
#X-bar chart#control chart interpretation#stratification#process standard deviation
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