Six Sigma Green Belt Certification Practice Exam

Which option is defined as "having an operator make similar measurements close to the same time"?

1. Precision

2. Nominal

3. Calibration

4. Accuracy

The correct answer is: Precision

The term that refers to "having an operator make similar measurements close to the same time" is indeed a definition of precision. Precision focuses on the consistency of measurements when repeated under the same conditions, indicating how closely the results can cluster around each other. In practice, if multiple measurements are taken by the same operator in a short time frame and yield similar results, those measurements are considered precise. Precision is a critical concept in quality control and Six Sigma methodologies, as it helps assess the reliability of measurement systems and processes. It indicates the ability to reproduce findings and maintain stability within a system. Nominal refers to the standard or target value that a measurement aims for, which does not relate to the consistency of repeated measurements. Calibration involves comparing and adjusting measurement instruments to ensure accuracy against a known standard, which also is not about the repetition of measurements over time. Accuracy denotes how close a measured value is to the true value or target, which again is not specifically about the variability or consistency of results from repeated measurements. Understanding precision is crucial in quality management as it helps teams identify process capability and control variations that could affect product quality and performance.