Formula for Calculating Confidence Interval at 90% Confidence Level

C

convivial

Hi,

I want to find the confidence interval of failure probability at 90% confidence level. I have seen that with the help of tables one can find out the values of failuire probabilities at 5% and 95% confidence level but is there any formula as well for it?
 
C

convivial

Re: Calculating confidence interval.

thanks for your reply but i need the formulae used to find confidence intervals instead of an applet.
 
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