The overall average on a process you are attempting to monitor is 55.0 units. The process population standard deviation is 1.72. Sample size is given to be 16.
a) Determine the 3-sigma x -chart control limits
Upper Control Limit (UCL- ) = _____ units (round your response to two decimal places).
Lower Control Limit (LCL- ) = _____ units (round your response to two decimal places).
B) Determine the 2-sigma x -chart control limits
Upper Control Limit (UCL- ) = _____ units (round your response to two decimal places).
Lower Control Limit (LCL- ) = _____ units (round your response to two decimal places).
How do the control limits change?
A-The control limits for the 2 -sigma overbar x-chart and for the 3-sigma x -chart are the same
B- The control limits are tighter for the 2-sigma overbar x -chart than for the 3-sigma x -chart.
C- The control limits are tighter for the 3-sigma overbar x -chart than for the 2-sigma x -chart.