Confidence Interval Calculator
Calculate confidence intervals for population means and proportions with different confidence levels.
Results:
Formula
Z-Score
Step-by-Step Solution
Notes
- Confidence Interval: Range of values that likely contains the true population parameter
- 90% Confidence: 90% chance the interval contains the true value
- 95% Confidence: 95% chance the interval contains the true value
- 99% Confidence: 99% chance the interval contains the true value
- For finite populations, the finite population correction factor is applied