Six Sigma Green Belt Certification Practice Exam

Many Six Sigma practitioners focus on determining short-term variability with an assumed adjustment of _________ to compensate for drifts to get long-term variability.

1. 1.00 Sigma

2. 1.33 Sigma

3. 1.50 Sigma

4. 2.00 Sigma

The correct answer is: 1.50 Sigma

In the context of Six Sigma, determining short-term variability involves analyzing the process performance over a short period, while long-term variability considers the entire duration of the process. The adjustment factor found in many Six Sigma methodologies is used to account for the natural drifts and shifts in the process that occur over time. A common practice in Six Sigma is to use an adjustment of 1.5 Sigma to represent this shift. This adjustment reflects empirical findings that show processes tend to drift away from the mean over time. By applying this adjustment, practitioners can effectively anticipate and mitigate the impact of variability that may not be captured in short-term studies, providing a more robust indication of the process's long-term capability. This approach allows teams to better manage quality and ensure that process performance remains within acceptable limits in the long run. In contrast, other adjustment factors, such as 1.00, 1.33, or 2.00 Sigma, do not align with the widely accepted practices for capturing the nuanced shifts in long-term process behavior, making them less effective for this purpose.