Six Sigma Green Belt Certification Practice Exam

Which measure shows the ratio of defects to units?

1. DPU

2. DPO

3. DPMO

4. PPM

The correct answer is: DPU

The measure that shows the ratio of defects to units is known as Defects Per Unit (DPU). This metric provides insight into the quality of a process by quantifying how many defects are present in each unit produced. By analyzing DPU, organizations can identify areas for improvement, as a lower DPU indicates a higher quality output. This measure specifically focuses on the total number of defects identified in a sample and divides that number by the total units produced, making it a straightforward way to express the relationship between defects and the production output. While other metrics such as Defects Per Opportunity (DPO), Defects Per Million Opportunities (DPMO), and Parts Per Million (PPM) are related to the assessment of quality and defects, they focus on different aspects or contexts. DPO is more about the number of defects per opportunity for a defect, DPMO takes into account the number of defects per million opportunities, and PPM conveys defects in relation to a million parts produced. However, when looking specifically at the ratio of defects relative to units produced, DPU is the most direct and relevant measure.