Confidence Interval Calculator
Calculate the confidence interval for a population mean using sample data. Uses z-based approximation suitable for large samples.
Inputs
Results
Lower Bound
48.04
Upper Bound
51.96
Margin of Error
1.96
How to Use This Calculator
- Enter Sample Mean (x̄), Standard Deviation (σ or s), and Sample Size (n).
- Set Confidence Level (%).
- Review Lower Bound, Upper Bound, and Margin of Error.
- Use Standard Error and Z-Value to inform your decision.
- Use the chart to visualize the results and explore different scenarios by adjusting inputs.
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