Film thickness data

An engineer wants to assess the capability of a process that coats large rolls of paper with a thin film. The engineer collects three measurements of coating thickness from 25 consecutive rolls. Because the machine is reset for each new roll, the engineer needs to consider variation between rolls in addition to variation within a roll. The film thickness must be 50 ± 3 microns to meet engineering specifications.

You can use this data can be used to demonstrate Between/Within Capability Analysis.