A quality engineer for a plastic parts company monitors an injection molding process. A machine has a die that creates five parts at one time. The engineer collects 20 subgroups of five parts each. The engineer monitors both the within-subgroup variation between parts that are created at the same time and the between-subgroup variation between the batches.
You can use this data to demonstrate Xbar-S Chart.
|Parts||The measurement of the sampled part|
|Subgroup||The subgroup identifier|