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. a single plot falls above or below the control limits
b. normal behavior
c. a large number of plots are on or near the central line
d. no real trend in any direction
e. a change in raw materials or operators

A) A single plot falls above or below the control limits

Explanation:

The whole idea behind quality control is to identify events that need corrective action in the production process. Quality control requires that all units are tested to determine if they meet the standard.

Any unit that falls below or above the control limits must be investigated and retested in order to determine why it occurred and how you can prevent it from occurring again.

answer; no individual buyer or seller has any significant impact on the market price;