Determine the three-sigma x-chart control limits

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Reference no: EM131708875

The overall average on a process you are attempting to monitor is 55.0 units. The process population standard deviation is 1.84. Sample size is given to be 4.

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 the controls do limit 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.

Reference no: EM131708875

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