Confidence intervals for a proportion and the margin of error

What this note covers

1. From a point estimate to an interval
2. A complete confidence-interval calculation
3. Margin of error and confidence level
4. Interpreting confidence with fixed p
5. Conditions and limits of the approximation
6. Reporting and comparing interval estimates
7. Using intervals to assess a threshold
8. Auditing an interval calculation and conclusion

8 sections · 10 key terms & formulas · 6 common mistakes