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 ...

The Mann-Whitney U Test, also known as the Wilcoxon Rank Sum Test, is a non-parametric statistical test used to compare two samples or groups. The Mann-Whitney U Test assesses whether two sampled ...

Journal of the Royal Statistical Society. Series B (Statistical Methodology), Vol. 79, No. 1 (JANUARY 2017), pp. 225-246 (22 pages) We propose new methodology for two-sample testing in high ...

This paper proposes a distribution-free test for the two-sample scale problem in ranked set samples. The proposed test assumes that the distribution functions of the populations have a common quantile ...