If you collect data as individual observations, the subgroup size is 1.
|Observation 1||Observation 2||Observation 3|
|Reported By||R. Bukowski|
|Time Span||03/01/16 - 04/30/16|
|Data Trace||Bin # 1057a-9942|
You can store this worksheet as a template for new worksheets. Then, you will only need to change the values in C2.
When you have a single specification that is a hard limit, or when you have two specifications that are both hard limits, Minitab does not calculate Z statistics or process capability statistics. Also, when all your units are defects, Minitab does not calculate Z statistics. For information on how specifications and targets affect calculations, go to How Minitab chooses centering values for short-term statistics for Process Report.