A process control chart:
A. Assumes that 99.74% of random variations observed will fall within an upper and lower limit
B. Represents upper and lower control limits set at ± 2 standard deviations from the center line
C. Separates the assignable cause of variation from the common cause of variation
D. Assigns causes of variation to operator, machine, or material
E. Both a and c
Answer: E. Both a and c
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