What it does
Daniel Soper’s calculator collection covers distributions, ANOVA, probability, effect-related calculations and other statistical methods.
Daniel Soper's free statistics calculators link each method to formulas, references and related tools. The population-mean confidence-interval page asks for sample mean, sample size and sample standard deviation, then computes 90%, 95% and 99% intervals. Its stated model is a normal population, and the linked formula explanation uses the t distribution when population SD is unknown. That is distinct from the collection's known-population-SD calculator. The method and input summary can therefore be documented alongside the returned interval rather than treating all confidence calculators as interchangeable.
Strengths
- Calculator pages link formulas and references
- Broad coverage of distributions and statistical methods
Best for
- Documenting the method behind a statistical result
Sources
- Free Statistics Calculators - Home (Oct 26, 2026)
- Population Mean Confidence Interval Calculator - Daniel Soper (Oct 26, 2026)
- Population Mean Confidence Interval Formula - Daniel Soper (Oct 26, 2026)