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zjuv007
zjuv007
Level III

Sample Size for Weibull Distribution - Reliability

Created: May 16, 2020 10:03 PM  |  Last Modified: May 16, 2020 10:07 PM (1578 views)

Hello,

I have prior testing of n=22 samples, with 2 failure modes/locations. The Y of interest is lbf and ALL samples are tested to failure (no censoring). I want to use this data to determine the necessary sample size I must use for the same test to ensure that at least 95% of the selected population covered at a 95% lower confidence bound (Lower Spec limit).

 

The aggregate data fits a weibull distribution with a P-value of 0.175, mean of 12.716, std dev = 0.763, shape = 25.773, and scale =13.015 for the Weibull fit.

 

How can I determine the minimum sample size I will need (based on prior testing knowledge from above) to ensure 95/95 for a lower spec limit of 5.2 lbf?

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1 REPLY 1
Mark_Bailey
Staff Mark_Bailey
Staff

Re: Sample Size for Weibull Distribution - Reliability

May 17, 2020 07:45 AM (1548 views)  |  Posted in reply to message from zjuv007 05-16-2020

I am not sure if this tool will do what you want, but see the Reliability Demonstration calculator under DOE > Design Diagnostics > Sample Size and Power.

 

See Help > JMP Documentation Library > Design of Experiments Guide > Reliability Demonstration Calculator section for more information and a worked example.

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