Sample Size Calculator
Estimate required sample size for a population proportion with chosen confidence and margin of error.
Result
Sample Size Formula
n0 = z²×p(1−p)/e²
With finite population correction:
n = n0 / [1 + (n0−1)/N]
Sample Size Example Calculation
95% confidence, 5% margin, p=50% gives sample size about 385.
Frequently Asked Questions about Sample Size
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