which of the following situations does not indicate that a process being monitored with a control chart should be investigated to see if the process is out of control?
A: two or more consecutive plots are close to the upper limit if the control chart
B: a run of 5 more consecutives plots are above the center line of the control chart
C a series of consecutive plots are evenly distributed close to the center line of the control chart
D: a series of five or more consecutive plots exhibits an increasing trend towards the upper limit of the control chart
E: a single plot falls below the lower limit of the control chart