A control chart is best described as:
a. a simple tool designed to quantitatively monitor important characteristics of a process.
b. the spread of the process which is equal to six standard deviations when the process is in a state of statistical control.
c. a picture that allows us to see what changes have occurred over a period of time, and to study the impact of various factors in the process that change.
d. A & C
Answer: D
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