Just a quick question I came across going over quant. For a normal variable: 90% confidence interval is Xbar +/- 1.65s, etc etc Then again, we are shown the confidence interval as Point Estimate +/- Reliability factor x standard error Is this second formula for non-normal distributions? I’ve been over this a million times, just wanted to clarify once and for all. Thanks a lot.
the 1.65 in the first equation is the Reliability factor for the 90% CI in a normal distribn. Both are the same thing…