For Exercises 12.11 to 12.13, see page 612; for 12.14 and 12.15, see page 614; for 12.16 to 12.18, see page 619; and for 12.19 to 12.21, see pages 625–626.
12.19 Specification limits versus control limits.
The manager you report to is confused by LSL and USL versus LCL and UCL. The notations look similar. Carefully explain the conceptual difference between specification limits for individual measurements and control limits for .
12.19
Specifications limits track whether or not a process can meet a specification, often designated by a customer. The USL and LSL are determined by the customer, and then the process is monitored to see if the process can satisfy the customer’s demands. Control limits track whether or not a process is in control, without special cause variation acting on it. It measures inherent variation in the process and does not specify if the process can meet a customer’s specifications, only whether the process is free from outside special cause variation.