Six Sigma Green Belt Certification Practice Exam

The capability index is the correct choice for process capability analysis. This statistical tool quantifies how well a process meets specified limits or specifications. It essentially allows for the assessment of a process's capability by comparing the width of the process spread to the width of the specification limits. A higher capability index indicates a more capable process, meaning it consistently operates within the desired thresholds. This index provides crucial insights into whether a process can produce products that meet quality standards, which is fundamental in Six Sigma methodology.

While scatter plots, control charts, and histograms are important statistical tools, they serve different purposes. Scatter plots help visualize relationships between two variables, control charts are used to monitor process stability and variability over time, and histograms are employed to show the distribution of data. While all these tools are vital in the realm of data analysis, they do not specifically assess process capability in the same way the capability index does.