To check if a process is in control,we need ______.
A)both a mean chart and a range chart
B)only a mean chart
C)only a range chart
D)only a process capacity index

Question

Quizplus · Accepted Answer

To check if a process is in control, we need to monitor the variation and average of the process. The mean chart helps us to monitor the average or central tendency of the process, whereas the range chart helps us to monitor the variation or dispersion of the process. By analyzing the data on both the mean chart and range chart, we can determine if the process is in control and make improvements if necessary. Process capacity index just tells us how well the process is performing from a specification limit perspective, but it does not provide any information on the process stability or control. Therefore, A) both a mean chart and a range chart is the best choice.

To Check If a Process Is in Control,we Need ______