Confidence Interval Calculator
Calculate confidence intervals for means, proportions, and differences using Z and T distributions. Supports batch processing, sample size estimation, and visual analysis of intervals.
Key Features
- • Confidence intervals for mean (known & unknown variance)
- • Proportion & difference calculations
- • Z-score and T-score support
- • Sample size calculator
- • Batch processing via CSV or text
- • Interactive CI visualization (line chart)
- • Calculation history with export options
- • Step-by-step formula breakdown
Use Cases
- • Statistical data analysis
- • Research & hypothesis testing
- • Survey & polling analysis
- • Medical and scientific studies
- • Business & market research insights
How It Works
- • Select calculation type (mean, proportion, difference)
- • Enter sample data and confidence level
- • Choose Z or T distribution automatically
- • View confidence interval and margin of error
- • Analyze results with visualization & export
Calculator Settings
Parameters
Sample Size Calculator
CSV format: n,mean,sd,confidence_level