Confidence Interval Calculator — math calculators and step-by-step solvers
The Confidence Interval Calculator builds a confidence interval around a sample mean when the population standard deviation is known. Enter the mean, the standard deviation, and a positive sample size, choose a 90%, 95%, or 99% confidence level, and the tool returns the standard error, the margin of
Category: Statistics
About this tool
What Is Confidence Interval Calculator? Confidence Interval Calculator The Confidence Interval Calculator builds a confidence interval around a sample mean when the population standard deviation is known. Enter the mean, the standard deviation, and a positive sample size, choose a 90%, 95%, or 99% confidence level, and the tool returns the standard error, the margin of error, and the lower and upper bounds of the interval. Use it in statistics homework, quality control, and survey research to express how precisely a sample estimate pins down a population value.. How to Use Make sure you understand the formula or method this tool uses. Enter your values in the correct fields with compatible units. Review the result, compare it with expected values, and use the related tools if needed. Frequently Asked Questions How do I use Confidence Interval Calculator? Enter the required data in the appropriate fields and the tool will display the result immediately.