Population Mean (with known standard deviation) Confidence Interval Formulas

Population Mean (with known standard deviation) Confidence Interval Formula

Below you will find descriptions and details for the formula that is used to compute the confidence interval for a population mean in situations where the population standard deviation is known.

Confidence interval for a population mean:

Variable definitions: x = sample mean z = a standard normal score α = desired confidence level σ = population standard deviation n = sample size