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Customer quantile

Hello, 

 

looking for the upper and lower cut off of exponential distribution and Weibull distribution, I could find custom quantile to designate the probability. Have a couple questions.

 

In the old jump version, saw it quantile feature allowing probability number to type, it is the same as custom quantile in JUMP 17.

Seems like there is confidence level set as default value of 0.95, having tried different numbers 0.9 or 0.99, did not see the difference in the custom quantile number. 

 

Hoping it to use to set the spec limit out of data built over a long time, can I know if Custom quantile @confidence level of 0.95 is good to use for it?

 

Thanks in advance.

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