The Slovin’s formula is used to estimate the sample size needed to create a realistic model using the population size and the acceptable margin of error:
n = N / (1 + Ne^2)
The following calculator allows you to apply the Slovin’s formula and find the sample size.
You need to provide the population size N and the acceptable margin of error e:
Sample size (n): 171
I hope this calculator is useful. Happy analyzing!