What is Confidence Interval calculator?
A confidence interval calculator calculates both a confidence interval for a mean and a confidence interval for a standard deviation. The calculation uses the normal distribution or Student's distribution for the confidence interval of the mean, and the chi-squared distribution for the confidence interval of the standard deviation.
Confidence Interval Calculator
Why we use Confidence Interval calculator?
The confidence level is the level of confidence required that the true value of the parameter will lie within the confidence interval. Researchers typically use a confidence level of 0.95 so the default is set as a 95 confidence interval calculator, but you can change the confidence level.
This confidence interval calculator reports results in APA style.
The online confidence interval calculator displays formulas and provides step-by-step calculations.