Developed by Michael Whitlock at The University of British Columbia. This web calculator conducts a pooled-variance t-test for a difference between two populations' means when standard deviations are ...

Statistics is a branch of math that involves the collection, description, analysis, and inference of conclusions from quantitative data. But what is a statistic? Let’s find out. The word statistic is ...

A two-sample z-test for population means compares two population means. It is appropriate when the population standard deviations are known and the sample sizes are large. This web calculator conducts ...