"Dirk Van de moortel" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > > from which you can easily algebrate and calculate mu1 and mu2 ;-)
Thanks for the answer. I've worked out how to do most of it, and I have an equation to use. The equation is CL (lower) = xbar - z(st.dev/sample size) It have applied it fine in case where z has been supplied. What I need to know though is how do I get the value of z? 'z' is defined as "the (Normal) value such that P(-z < Z < z) = CL. I have no clue how to get it - I tried to get it via the Inverse General Normal table but I couldn't match the value that was supplied to me. e.g. Confidence Level 0.90 then z = 1.645 . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
