Six Sigma Green Belt Certification Practice Exam

Which method of quantifying measurement errors combines repeatability and reproducibility together in the analysis system?

1. Analysis of Variance method

2. ANOVA method

3. Average and Range method

4. Range method

The correct answer is: Range method

The correct method for quantifying measurement errors that combines repeatability and reproducibility is referred to as the Average and Range method. This method assesses variation within a measuring system by evaluating consistent measurements (repeatability) along with the ability to achieve consistent results across different operators or measuring intervals (reproducibility). By capturing both types of variation, the Average and Range method enables the analysis of the overall measurement system performance, ultimately providing insights into areas that may require improvement. The Analysis of Variance method and ANOVA method, while useful for assessing differences between groups, focus more on the statistical analysis of variance rather than systematically quantifying measurement errors. The Range method solely looks at the spread of data and does not combine both repeatability and reproducibility in its approach. Therefore, focusing on the average and range of measurements provides a more comprehensive view of the measurement system's accuracy and reliability.