What is the Confidence Interval Calculator?

The Confidence Interval Calculator determines the range within which a population parameter, such as the mean, is likely to fall based on a sample. It uses the sample mean, standard deviation, sample size, and confidence level to calculate an interval estimate. This is essential for understanding the precision of sample statistics and making informed inferences about the population.

How to Use:

1. Enter Sample Mean (x̄): Input the average value from your sample data.
2. Enter Standard Deviation (σ): Type the standard deviation of your sample.
3. Enter Sample Size (n): Provide the number of observations in your sample.
4. Enter Confidence Level (%): Specify the desired confidence level (commonly 90, 95, or 99%).
5. Click “Calculate”: The calculator computes the lower and upper bounds of the confidence interval.
6. Review the Result: The displayed range shows where the true population mean is likely to lie with the selected confidence level.