What is the Confidence Level Calculator?

The Confidence Level Calculator is a statistical tool that helps users estimate the range within which the true population mean is likely to fall, based on a sample. By entering the sample mean, standard deviation, sample size, and desired confidence level, the calculator computes the margin of error, identifies the corresponding z-value, and generates the confidence interval. This allows students, analysts, and researchers to make informed decisions and quantify uncertainty when interpreting sample data.

How to Use:

1. Enter Sample Mean (x̄): Input the average of your sample data.
2. Enter Standard Deviation (σ): Input the standard deviation of the sample or population.
3. Enter Sample Size (n): Input the number of observations in your sample.
4. Enter Confidence Level (%): Input the desired confidence level (e.g., 90, 95, 99).
5. Click “Calculate”: The calculator computes the margin of error, z-value, and confidence interval.
6. Review Result: The output shows the confidence interval and provides an interpretation, indicating the range in which the true population mean is likely to lie with the specified confidence level.