Exact Confidence Interval Calculator for Proportion
Introduction & Importance
An exact confidence interval for a proportion is a range of values around an estimated proportion that indicates the reliability of the estimate. It’s crucial for understanding the precision of your estimates and making data-driven decisions…
How to Use This Calculator
- Enter the proportion you’re estimating.
- Enter the sample size used to estimate the proportion.
- Select the desired confidence level.
- Click ‘Calculate’.
Formula & Methodology
The calculation uses the Wilson score interval, which is an exact method for constructing confidence intervals for a binomial proportion…
Real-World Examples
Data & Statistics
| Method | Proportion | Sample Size | Confidence Interval |
|---|---|---|---|
| Wilson Score Interval | 0.5 | 100 | 0.408 – 0.592 |
| Wald Interval | 0.5 | 100 | 0.400 – 0.600 |
Expert Tips
- Always use the Wilson score interval for exact confidence intervals.
- Consider the sample size when interpreting the results.
- Use these intervals to make informed decisions based on your data.
Interactive FAQ
What is a confidence interval?
A confidence interval is a range of values around an estimate that indicates the reliability of the estimate.
Why use an exact confidence interval?
Exact methods provide more accurate intervals, especially for small sample sizes or extreme proportions.
CDC Statistics | NIST Statistical Science | UK Office for National Statistics