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You are using a control chart for quality control purposes. Which of the following statements are accurate regarding control charts? (Select three.)

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.

Common causes of variance that fall outside the acceptable range are difficult to correct and usually require reorganization of the process. Decisions to change the process are not within the project manager’s authority and always require management approval. 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.