Based on the following manufacturing defect rate data, determine which quality tool is most appropriate for monitoring and detecting small shifts in the mean of the manufacturing process over time. Time Period Defect Rate (%) Quarter 1 0.5 Quarter 2 0.4 Quarter 3 0.7 Quarter 4 0.6
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✓ Correct answer: D. Statistical Process Control (SPC)The correct answer is Statistical Process Control (SPC). SPC is used to monitor production processes, allows detection of small shifts in mean, and is math-based using control charts and range limits. Check sheets are for data collection, cause-and-effect diagrams identify causes of problems, and scatter diagrams are for analyzing relationships between two variables.
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