A quality engineer wants to evaluate a wire insulation process. The engineer randomly selects lengths of electrical wire and tests them for weak spots in the insulation by subjecting them to a test voltage. She records the number of weak spots (defects) and the length of each wire in meters.
Because the data are counts of defects, you can use it to demonstrate U Chart or Poisson Capability Analysis.
|Weak Spots||The number of weak spots in the sample of wire|
|Length||The length of the wire. This is the subgroup size.|