confidence level

A tutorial on computing the sampling size for the desired margin of error of population proportion estimate at given confidence level.

A tutorial on computing the interval estimate of population proportion at given confidence level.

A tutorial on computing the sampling size for the desired margin of error of population mean estimate at given confidence level.

A tutorial on computing the interval estimate of population mean at given confidence level. The variance of the population is assumed to be unknown.

A tutorial on computing the interval estimate of population mean at given confidence level. The variance of the population is assumed to be known.