The formula for calculating sample size for an unknown population is:
n = [(Zα/2)² * p * (1-p)] / e²
Where:
n = sample size
Zα/2 = the critical value of the standard normal distribution at alpha/2 level of significance
p = the estimated proportion of the population with a particular characteristic
e = the maximum allowable error or margin of error
The value of Zα/2 depends on the level of confidence desired, p is the estimated proportion of the population with the characteristic of interest, and e is the allowed margin of error.
Formula for calculating sample size for unknown population
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