Mon, 01/07/2013 - 11:31
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It’s your first day at the Jedi Temple, working as a lightsaber manufacturer. Your first task on the job is to run a capability analysis on the length of lightsabers being produced. Your main concern is to see if the lightsabers fit within the required length specifications set forth by the Jedi Council. You aren’t quite sure where to start. Thankfully, Minitab Statistical Software is there to help you—even in a galaxy far, far away.
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Capability analysis is used to assess the capability of an in-control process. A “capable” process is able to produce products or services that meet specifications.
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Comments
Interesting Introduction
This is an interesting introduction to capability analysis, and I couldn't agree more that you have to get your data right.
I have a question, though, about this scenario, where "the lightsabers were measured by a different Jedi each day for 10 days, with eight sabers being measured by each." Why would you do that? What you end up with is within-subgroup variation measured across each day in (probably) an s-chart, and between-subgroup variation tracked in the x-chart. That's good, but now we don't know if the between-subgroup variation is day-to-day variation or Jedi-to-Jedi variation. This scheme would only work if you have already established excellent reproducibility, so you could dismiss Jedi-to-Jedi variation as a confounding factor.
On an unrelated note, I thought it was a little ironic that the primary ad in the middle of this article about Minitab was an ad for JMP.
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