# Statistics

Statistics summarizes and tests data with averages, measures of spread, percentiles and quartiles, z-scores, correlation, linear regression, confidence intervals and hypothesis tests. It matters whether your numbers are a whole population or a sample, because sample variance divides by n − 1 instead of n.

## Tools

- Standard Deviation Calculator (Coming soon): Find the standard deviation, variance, mean and range of a data set, for a sample or a whole population.

---

Category: [Math & Statistics Calculators](https://techolm.com/math-calculators)