Question: What is used as a visual aid when examining a scatter diagram? A. Trend line b. A vertical scale c. Horizontal line at the mean

What is used as a visual aid when examining a scatter diagram? A. Trend line b. A vertical scale c. Horizontal line at the mean of the y values d. Center line if one or more signals of an out of control process are present in a control chart, what must be eliminated to bring the process into statistical control? A. Special causes b. Common causes c. Normal variation d. Natural causes

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