A production manager at a pottery factory has noticed that about 70 percent of defects result from impurities in raw materials, 15 percent result from human error, 10 percent from machine malfunctions, and 5 percent from a variety of other causes. This manager is most likely using which tool or technique?
1) a Pareto chart.
2) a scatter diagram.
3) a quality loss function.
4) a cause-and-effect diagram.
5) a flowchart.