Practice Quiz

Six Sigma Green Belt

Category - Black Belt

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A plant manager notices a high variation in output quality from 8 machines within one production cycle. He collects the average defects per total output for each machine per hour. As a variable, output defects is:
  1. critical to process
  2. critical to quality
  3. critical to delivery
  4. critical to safety
Explanation
Answer: B - As a variable, output defects is critical to quality (CTQ).

Key Takeaway: In quality control, a business manager must collect relevant data and calculate a sample statistic in order to compare subgroups. In this example, the 8 machines are subgroups while the defects per total output provides a variable that is critical to quality (or CTQ). This comparison allows the manager to address the variations in quality and make recommendations such as replacing the faulty machines.
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