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Statistical process control (spc)

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Statistical process control (spc)

  1. 1. STATISTICAL PROCESS CONTROL • a MATHEMATICAL TECHNIQUE to interpret and organize numerical data • a set of linked activities that add value or produce an item. • a REGULATORY MECHANISIM to ensure correct characteristics performance
  2. 2. Statistical Process Control (SPC) Statistical process control • is applied in order to monitor the product and control the process.
  3. 3. SPC used .. • Control the process as product are produced • Inspect sample of finished products
  4. 4. 2 types of product characteristics: Attributes and Variables Attributes • A characteristic measured by comparison Ex. Good/bad, pass/fail Variables • A characteristic measured by physical units Ex. Millimeter, volts, weight, volume
  5. 5. 2 causes of variation • Common cause - implemented in process due to design of product. • Special cause - not present in process arises in certain circumstances.

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