Confidence intervals are a standard output of many free and paid A/B testing tools. Most A/B test reports contain one or more interval estimates. Even if you’re simply a consumer of such reports, ...

In the first article in this series,1 we presented an approach to understanding how to estimate a treatment's effectiveness that covered relative risk reduction, absolute risk reduction and number ...

Editor’s note: Robert J. Moore is the co-founder of RJMetrics, a company whose software helps online businesses make smarter decisions using their own data. He also previously served on the Investment ...

Business, like many other fields, can benefit from the use of statistics in estimating or predicting future events. An important tool for business statistics is a confidence interval, which helps a ...

Journal of the American Statistical Association, Vol. 66, No. 335 (Sep., 1971), pp. 609-613 (5 pages) ...

The proverb "practice makes perfect" highlights the importance of repetition to master a skill. This principle also applies to learning vocabulary and other materials. In order to fight our natural ...