Question: During the control quality process, you are reviewing a chart which has some lines above and below the x-axis and a cyclic line between them.

During the control quality process, you are reviewing a chart which has some lines above and below the x-axis and a cyclic line between them. What is the purpose of this chart?

(a) To gather quality control data

(b) To find the dependency between the variables

(c) To find the trend

(d) To determine if the process is stable

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