Sample Size Calculator
Determine the required sample size for a population given confidence level, margin of error, and estimated proportion.
Formula:
n₀ = (Z² × p × (1-p)) / E²
n = n₀ / (1 + (n₀-1)/N)
Where:
- Z = Z-score for confidence level
- p = estimated proportion (in decimal)
- E = margin of error (in decimal)
- N = population size