### Possible Answer

do you mean the formula that used in this software ? i used slovin’s,, you can see the formula when press the “information” button in this software. - read more

Slovin's Formula Sampling Techniques. When it is not possible to study an entire population (such as the population of the United States), a smaller sample is taken using a random sampling technique. Slovin's formula allows a researcher to sample the population with a desired degree of accuracy. - read more

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