Process Control for variables can be done via Control Charts, such as Mean (X-ba

Question

Process Control for variables can be done via Control Charts, such as Mean (X-bar) and Range (R-bar) Charts. Both of these charts are required to determine if a Process is in Control or Gone out of Control. The statement that best describes the difference between two charts is:

a. X-bar chart determines the Spread of the Process Dispersion and R-bar chart determines Shift in the Process Mean a

b. Both X-bar and R-bar Charts determine the determine the Spread of the Process Dispersion.

c. Both X-bar and R-bar Charts determine the shift in the process Mean

. d. X-bar chart determines the Shift in the Process Mean and R-bar chart determines the Spread of the Process Dispersion.

Explanation / Answer

Range chart ( R-Chart ) : uses amount of dispersion in a sample

Mean chart ( x -Chart ): uses process average of a sample

Therefore option D ( X-bar chart determines the Shift in the Process Mean and R-bar chart determines the Spread of the Process Dispersion.) is the right answer .

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