Confidence Interval Calculator
Calculate confidence intervals for population means and proportions. This calculator helps you estimate population parameters based on sample statistics and desired confidence levels.
Common Applications:
- Market research and surveys
- Quality control in manufacturing
- Medical research and clinical trials
- Financial data analysis
Calculation Type
Common Parameters
Important Notes:
- Sample size should be at least 30 for normal approximation
- For proportions, sample size × p and sample size × (1-p) should both be > 5
- Higher confidence levels result in wider intervals
- Larger sample sizes result in narrower intervals