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TOPIC: Control chart question

Control chart question 2 years 5 months ago #9579

  • Lawrence Li
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Hi all, this question from Oliver Lehmann

I wonder why the answer is A? Thanks
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Last edit: by Cornelius Fichtner.

Control chart question 2 years 5 months ago #9608

  • Steven McClaugherty, PMP, CSM
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This is a good question and am curious about the answer as well, and explanation of why something should be adjusted or improved. I tried to research to see if I could find some additional interpretation (other than Rule of 7 or exceeding a control limit).

Based upon the answer being A, so if a chart that is high precision and low accuracy needs "adjusted", then does that make a low precision and high accuracy needs "improved"? If we say adjusted or improved with the process, what would be a proposed action/change (as an example?)

I am trying to think of how to interpret this. Would it mean?

Low Precision and Low Accuracy = is the visual here there is a great scatter on both sides of the mean up to/near control limits?
Low Precision and High Accuracy = needs improved?
High Precision and Low Accuracy = needs adjusted (according to the answer)
High Precision and High Accuracy = near perfect world (on or at the mean) no change based on deviation assigned.
Is there any meaning when you have more data points on one side of the mean than the other (aside from violating Rule of 7)?

Are there any other example charts that show visually what the control process would look like based on the other 3? Did anyone have Control Chart questions on their PMP exam? If so, do you recall what you had to identify with it? I don't want to get too far down in the weeds.

Thanks.

Control chart question 2 years 5 months ago #9622

  • Lawrence Li
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I just searched for other comments on the web (very few source) saying that
high precision with low accuracy then adjust
low precision with low accuracy then improve

what I can do now is to braindump this
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