used more than 50 million times!
Calculator: Confidence Interval for the Population Mean (when population std dev is known)
Confidence Interval Calculator for the Population Mean (when population std dev is known)
This calculator will compute the 99%, 95%, and 90% confidence intervals for the mean of a normal population when the population standard deviation is known, given the sample mean, the sample size, and the population standard deviation.
Please enter the necessary parameter values, and then click 'Calculate'.