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TOPIC: Accuracy and Precision

Accuracy and Precision 6 months 4 weeks ago #16359

  • Julia Soligo
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Hi,

I would appreciate if you could explain this question (control chart attached):

You were able to obtain measuring equipment with very high accuracy and precision. You used it to make a sequence of measurements directly at a production process output and depicted the results on the following control chart.
(control chart attached)
Which statement is the best conclusion from these results?
(A)The process has high precision but low accuracy. It should be adjusted.
( B ) The process has high precision but low accuracy. It should be improved.
(C) The process has high accuracy but low precision. It should be adjusted.
(D) The process has high accuracy but low precision. It should be improved.

Correct answer is (A). In my opinion, the process has low precision and low accuracy, according the definiton of both (attached representation), since lots or measures are far from the mean and close to the upper specification limit (low accuracy) and the measures don't usually have the same values (low precision).

Hope you can help me understand. Thanks!
Julia
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Last edit: by Jenikka Ebias.

Accuracy and Precision 6 months 4 weeks ago #16360

  • Cornelius Fichtner
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Julia,

When posting sample questions in our forum, please always include a reference to where it is from.

Therefore, please add a note where you have found this. Thank you.
Until Next Time,
Cornelius Fichtner, PMP, CSM
President, OSP International LLC

Accuracy and Precision 6 months 4 weeks ago #16362

  • Julia Soligo
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Hi, I found this at Oliver F. Lehmann prep test (200 Prep Questions), Question 9.

Accuracy and Precision 6 months 4 weeks ago #16371

  • Julia Soligo
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Can someone explain this question result please?
Thank you very much!
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