Question

How does a Black Belt make use of hypothesis testing?

Answer 1

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A black belt can essentially test whether a process is a "6 Sigma" process. It means that there is only 1 out of 1 million chances of an error in the process. We can use the hypothesis testing technique with alpha at 1/1,000.000 th value.

For example, data from the recent region of stability, as identified by a 30,000-foot-level chart, can be used to statistically test for the following:

• Differences between machines
• Differences between facilities
• Differences between day of the week
• Differences between time of day
• Differences between suppliers
• Differences between customers