The use of basic graphical and statistical methods for analyzing and controlling the variation of a process, and thus continuously improving the process.

Question

Options

• AConfidence Interval
• BStatistical Process Control
• CDesign of Experiments
• DControl Plan

• A
  3% (1)
• B
  92% (35)
• C
  5% (2)

Explanation

Statistical Process Control (SPC) is exactly defined by the question - it uses graphical tools (like control charts) and statistical methods (like standard deviation analysis) to monitor, analyze, and reduce process variation over time, enabling continuous improvement.

Why the distractors are wrong:

• A. Confidence Interval - a single statistical calculation estimating a population parameter within a range; it describes uncertainty in data, not an ongoing process control methodology.
• C. Design of Experiments (DOE) - a structured approach to testing multiple input variables simultaneously to understand their effect on an output; it's about designing tests, not monitoring live process variation.
• D. Control Plan - a document that describes how a process will be controlled and monitored (what to check, how often, by whom); it's the plan, not the analytical methodology itself.

Memory tip: Think of SPC as a "process health monitor" - it uses charts (graphical) and stats to catch variation before it becomes a defect. The word "Control" in SPC maps directly to "controlling the variation of a process" in the question.

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