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Margin of Error Calculator: Precise Statistical Confidence Intervals

Demystifying statistical precision: Explore the crucial concept of margin of error in this comprehensive infographic.

A margin-of-error tells you how far your sample result can stray from the real population value. Plug in sample size, deviation or proportion, and a confidence level—the calculator returns the ± error and a full confidence interval. Larger samples shrink the error: at n = 1 000 and p = 0.5 the 95 % MOE ≈ ±3.1 % (U.S. Census Bureau, 2022).

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