In the process capability ratio, if both the upper and lower specification limits are greater than process variability, what can be inferred?

When both the upper and lower specification limits are greater than the process variability, it indicates that the range within which the process can operate is broader than the actual variability observed in the process. This means that the process has the capability to produce output that consistently falls within the specified limits. As a result, we can infer that the process can achieve the desired quality levels.

In this context, the specification limits define the acceptable range for the product characteristics, while process variability measures the extent of variation in the process outcome. When the variability is less than the distance between the specification limits, there is a good chance that most of the products will meet the quality standards set, thereby indicating a capable process that is likely to yield a high rate of quality output.

In contrast, if the process variability were to be comparable to or exceed the specifications, that would lead to a higher likelihood of producing output outside the acceptable limits, which would contribute to issues with quality levels and potentially necessitate intervention. Thus, the situation where process variability is less than both specification limits strongly supports the conclusion that the process can indeed achieve the desired quality levels.