quality control charts usually have a central line and upper and lower control limit lines. which of the following is not a reason that the process being monitored with the chart should be investigated? a sudden and sustained shift in the plots toward the upper or lower control limit a single plot falls outside of the control limits a large number of plots are on or near the central line there is an upward trend in the plots

A large number of plots on or near the central line is not necessarily a reason to investigate the process. This could indicate that the process is operating within acceptable limits and is not indicative of a problem. However, a sudden and sustained shift in the plots toward the upper or lower control limit, a single plot falling outside of the control limits, or an upward trend in the plots could all be reasons to investigate the process further.

Quality control (QC) is a procedure or set of procedures intended to ensure that a manufactured product or performed service adheres to a defined set of quality criteria or meets the requirements of the client or customer. QC is similar to, but not identical with, quality assurance (QA).

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