Well, above is the 415page of Pharmaceutical Quality by Desing Using JMP.
In above 90% at the last line is the Spec limit (LSL).
I am confusing the 1.3 looks like ensuring 90% Confidence. (1.282)
Can someone say that using 1.3 and this is 80% confidence?
I am sorry for the confusing question and many, but please help me.