Six Sigma Green Belt Certification Practice Exam

The index used to calculate attribute capability is indeed represented by the Cpm (Process Capability Index). Cpm is particularly useful in understanding how well a process can produce items within specification limits while considering a target value. This index not only looks at the spread of the data but also incorporates the concept of the target, making it a preferred metric for assessing the performance of a process when attributing capability to categorical data.

DPMO, p Chart, and c Chart do have roles in quality control and process analysis, but they do not specifically measure attribute capability in the same way that Cpm does. DPMO (Defects Per Million Opportunities) is mainly focused on defect analysis rather than overall process capability. A p Chart monitors the proportion of defective items in a sample, which is useful for quality control but does not provide a capability index. Similarly, a c Chart is used to monitor the count of defects in a sample, focusing more on the number of defects rather than assessing the capability of a process against specification limits and targets. Thus, Cpm is the comprehensive choice for calculating attribute capability.