The easiest way out of a sample size formula is Kukran.

If the population size will be determined:

N = volume of statistics

n = sample size

Z = The standard normal variable, which is 1.96 times the 95 percent confidence level

P = value of property in society. If you can not give it 0 / 5 considered. This Nqdar variance reaches its maximum.

q = percentage of people who are lacking in character (q = 1-p)

d = allowable error value

For example, if the population size is 400 and the statistical error allowed 0 / 05 consider.

Z = 1.96

p = q = 0 / 5

The formula will then Balahjm 196 samples.

If the population size will be determined:

For example, if the amount of error allowed 0 / 05 consider. The formula will then Balahjm 384 samples.