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# EIA calculation - sample size calculator _ online calculation tool

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Sample size calculator

definition

The sample size is also called the sample size, and the sample size determination is a closely related statistical estimate. The sample size of the statistical experiment is made into its number of observations. It is usually expressed as n and a positive integer. The sample size is any experimental study whose goal is to make an important feature related to the hypothesis from the sample population. Based on these three values, such as estimation, population standard deviation, and maximum error of confidence, to make an accurate estimate. The sample size is derived from the estimated maximum error and can be calculated from mathematical formulas.

$$n=( \frac {Z_{α/2 \cdot σ}}{E} )^2$$