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Question:
You are using a control chart to control the quality. Which of the following statements are correct about control charts?
A
Common causes of variance include random, known, or predictable, and variances that are always present in the process and common causes of variance are plotted on a control chart.
explanation
It is difficult to correct common causes of variance that fall outside of the acceptable range and those also requires the process to be reorganized. Management approval, which is not within the project manager's authority, is required for decisions to change the process. The rule of seven refers to when seven or more processes fall on the same side of the median; this indicates that an external factor may be influencing the results.
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