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.