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Process Capability DMAIC Analysis

Test your statistical reasoning in the Measure & Analyze phase:

Measure / Analyze: Process Capability (Cpk) Question 1 of 1
A manufacturing process exhibits a potential capability index of Cp = 1.65, but its actual capability index is Cpk = 0.82. What technical conclusion follows from this disparity?
A
The inherent process variation is excessively wide and cannot fit within specification limits.
B
The process has low enough dispersion to be capable, but the mean is significantly shifted away from the target center.
C
The measurement system is defective, requiring an immediate Gage R&R study.
D
The process fully meets customer requirements and is operating in statistical control.
✓ Statistical Rationale: Option B is correct. Cp > 1.33 indicates that the process spread (6σ) fits comfortably within specification tolerances. However, Cpk < 1.00 proves the process mean is off-center toward one of the specification limits, producing defects. The immediate corrective priority is centering the process mean, not narrowing variance.
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