providing accurate calculations for 18+ years!

Formulas: Confidence Interval for the Population Mean

Confidence Interval for the Population Mean Formula

Below you will find descriptions and details for the 1 formula that is used to compute confidence intervals for a population mean when the population standard deviation is not known.

Population mean confidence interval (when the population standard deviation is unknown):
Population mean confidence interval (when the population standard deviation is unknown) formula
where x is the sample mean, t is a value from the t-distribution, α is the desired confidence level, v is the degrees of freedom, s is the sample standard deviation, and n is the sample size.
Related Resources
Calculator Formulas References Related Calculators Search