Slovins’s formula is used to calculate an appropriate sample size from a population.
Some scenarios, we can't go through the whole population or even don't know what is population size. So sampling is useful to get expected result at certain level.
How to do sampling? and what's the confidence level?
For example:
Let's do a sampling with 1000 population and confidence level as 95%. After calculation, the sample size is 286.
1 2 3 | population = 1000; e = 0.05; n = 1000 / (1 + 1000 * 0.05 * 0.05) = 285.7 ~= 286 |
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