The chart provided represents a control chart, which is a statistical process control tool used to monitor process performance over time. In this case, the chart tracks the yield (a measure of output quality) over time. The control chart has three key lines:
The central line represents the average yield.
The upper control limit (UCL) and lower control limit (LCL) define the acceptable range of variation around the average yield.
Interpreting the chart:
Trend: The yield appears to be decreasing over time, as indicated by the data points moving below the central line.
Out-of-Control Signals:
Point sixteen is above the UCL, signaling an out-of-control condition.
Point four is farther than 2σ from the centerline, indicating another out-of-control signal.
Point eleven is farther than 1σ from the centerline, sending a third out-of-control signal.
Action: Given the declining trend and out-of-control signals, the quality manager should identify the root cause of the yield decline. This involves investigating factors that may be contributing to the decrease in yield and addressing them to improve process performance.
References:
ASQ Certified Manager Of Quality/Organizational Excellence (CMQ/OE) Body of Knowledge Map 2019
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