How To Calculate Sample Proportion Confidence Interval

What is Sample Proportion Confidence Interval and Why it Matters

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How to Use This Calculator

1. Enter your sample size, sample proportion, and desired confidence level.
2. Click the “Calculate” button.
3. View the results below the calculator.

Formula & Methodology

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Real-World Examples

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Data & Statistics

Comparison of Confidence Intervals

Sample Size	Sample Proportion	Confidence Level	Lower Bound	Upper Bound
100	0.5	95%	0.405	0.595
500	0.3	99%	0.268	0.332

Confidence Intervals for Different Confidence Levels

Sample Size	Sample Proportion	Confidence Level	Confidence Interval
200	0.4	90%	0.348 – 0.452
200	0.4	95%	0.336 – 0.464

Expert Tips

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  Interactive FAQ

  What is a confidence interval?

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  How does the sample size affect the confidence interval?

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  For more information, see these authoritative sources:

  • CDC – Confidence Intervals for Proportions
  • Introductory Statistics (OpenStax)