Margin of Error Calculator
Margin of Error
What is margin of error?
Margin of error or confidence interval reflects accuracy of the survey. The higher the confidence interval, the less accurate survey results from the overall population. Lower margin of error brings you more confidence and indicates that your survey has been effective.
MOE with Finite Population Correction Factor = (z-score)sqrt[p(1 − p)/n] × sqrt[(N − n)/(N − 1)] Where:
N = population, n = sample size, p = 0.5 (normal distribution)
80% − Z-Score = 1.28
85% − Z-Score = 1.44
90% − Z-Score = 1.64
95% − Z-Score = 1.96
99% − Z-Score = 2.58
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