Confidence Interval Calculator

Calculate Confidence Interval

Sample Mean (x̄)

Standard Deviation (σ)

Sample Size (n)

Confidence Level

Results

Enter values and click calculate to see results

Understanding Confidence Intervals

What is a Confidence Interval?

Range of likely values
Based on sample statistics
Contains true population parameter
Measures estimation precision

Components

Point estimate (mean)
Margin of error
Confidence level
Standard error

Common Uses

Research studies
Quality control
Survey analysis
Medical trials