1. Critical value

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.

2. Originally Posted by Morgan82
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.
Presumably you mean for a particular distribution (normal, t, chi-sq, F, ...)

Traditionally you look critical values up in a table, or nowerdays use an
appropriate software tool.

RonL

3. Originally Posted by Morgan82 in almost a repeat post (it does have some crucial additional information)
What is the critical value, or the z value of 90%?

For example, the z value of 95% = 1.96

How do 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.