Compute a confidence interval for a mean (from raw data or summary statistics) or for a proportion, at any confidence level.
Intervals on every estimate. ReliCheck Quanta reports confidence intervals throughout its output, from descriptives to regression coefficients. Free to try on your Mac. No Mac? Try the Quantitative Studio on the web.
Get QuantaA 95% confidence interval is a range built by a procedure that captures the true population value in 95% of samples. Narrower intervals mean more precise estimates; the width shrinks as sample size grows and as variability falls.
A common misreading: a 95% CI does not mean there is a 95% probability the true value lies inside this specific interval. The probability statement is about the procedure across repeated samples.