This is statistics stuff.
What is the critical value of 90% confidence?
I know for 95% it is.
I dont know how you find it.
The critical z-value for a 90% confidence interval is 1.64. This is easily found in either of the ways mentioned by CaptainB. Or alternatively, by making google your friend.Originally Posted by Morgan82 in almost a repeat post (it does have some crucial additional information)