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##### Sample Size

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Nov 7, 2018 9:40 AM
(210 views)

Hi,

I want to know how many samples I need to run to pass my spec (fail of 2%). I know the fail rate which is .6%. How would I do this in JMP?

In other words, a lot passes if it has less than 2% failing parts. How many samples do I need to run to be confident I will pass.

Thank you,

Rami

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You will find **Sample Size and Power** in the **DOE** menu. This command has moved so the exact location depends on the version. It is currently in the Evaluate Design sub-menu.

See **Help** > **Books** > **Design of Experiments**. There is a chapter about this platform and it shows examples that you can adapt to your problem.

Learn it once, use it forever!

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Are your data pass/fail or do you have continuous measurements that are compared to a spec? If it's the former, you'll want to use the One Sample Proportion calculator, and you will need a lot of samples (hundreds). If your data are continuous, you can probably make the same quality claim with far fewer samples. There are quite a few ways to do with continuous data. One approach would be to calculate a 98% tolerance limit and show that it is contained within your spec(s).

-- Cameron Willden