Using the chart below showing # of defects (counted) per unit per sample period, Determine the appropriate three-sigma control chart (UCL and LCL) c bar for the sample periods listed below Observation 1 2 3 4 5 6 7 8 9 10 11 # defects 11 4 3 5 6 1 4 2 3 2 3 Which sample periods/observations are outside of the control limits?



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