Statistics > Confidence Intervals > 1-Population Mean

This utility computes the confidence intervals for a population mean in one population, whether the population standard deviation is known or unknown. The confidence intervals are calculated using the following formulas:



where when population standard deviation is known
or when is unknown;
= sample mean
μ = population mean
s = sample standard deviation
= inverse cumulative probability of the Student's t distribution at 1 - α/2.
= inverse cumulative probability of the z distribution at 1 - α/2.



To use the utility, select Statistics > Confidence Intervals > 1-Population Mean.