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Statistical software quality assurance in software engineering involves __________

  1. using sampling in place of exhaustive testing of software
  2. surveying customers to find out their opinions about product quality
  3. tracing each defect to its underlying cause, isolating the vital few causes, and moving to correct them
  4. tracing each defect to its underlying causes, and using the Pareto principle to correct each problem found
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Answer according to official key is OPTION(3). i.e Statistical software quality assurance in software engineering involves "tracing each defect to its underlying cause, isolating the vital few causes, and moving to correct them." 

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