The Manufacturer wishes to set up a control chart at the final inspection station for a gas water heater. Defects in workmanship and visual quality features are checked in this inspection. For the past 22 working days a total of 176 water heaters were inspected and a total of 924 non conformities were found.
What type of control chart would you recommend and how would you use it? Using 2 water heaters as an inspection unit calculate the center line ,UCL, LCL that are consistent with the past 22 days of inspection data.