A statistic Q is to be used to monitor a process over time,using a control chart for that statistic.When the process is running in a state of control,it is known that the statistic Q has mean and standard deviation
.Which of the following is NOT a feature of the appropriate three-sigma control chart for Q?
A) Values of Q,obtained from regular samples from the process,will be plotted on the control chart against the time order of the samples.
B) A signal will be given if the value of the statistic Q falls between the upper control limit (UCL) and the lower control limit (LCL) .
C) The center line for the control chart will be set at
.
D) The lower control limit (LCL) will be set at
- 3
.
E) The upper control limit (UCL) will be set at
+ 3
.
Correct Answer:
Verified
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