Control charts are used to monitor and control a process. they use control limits to define the range of natural variation in a process. if a sample is taken and the plot point falls outside of the control limits what does this signify? 

 

A. the process is out of control and should be checked for assignable variation. 

B. the process is out of control and should be checked for natural variation. 

C. the process is in control. 

D. the process should be monitored for future results.

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