Hypothesis Testing

A two sample z-test is used to test whether two population means are equal. This test assumes that the standard deviation of each…

A one sample z-test is used to test whether the mean of a population is less than, greater than, or equal to some…

A two sample t-test is used to determine whether or not two population means are equal. This tutorial explains the following: The…

A one sample t-test is used to test whether or not the mean of a population is equal to some value. This tutorial explains…

A two proportion z-test is used to test for a difference between two population proportions. This tutorial explains the following: The motivation for performing…

A one proportion z-test is used to compare an observed proportion to a theoretical one. This tutorial explains the following: The motivation for performing…

The Wilcoxon Signed Rank Test is the non-parametric version of the paired t-test. It is used to test whether or not there is a…

A Mann-Whitney U test (sometimes called the Wilcoxon rank-sum test) is used to compare the differences between two independent samples when the…

A paired samples t-test is used to compare the means of two samples when each observation in one sample can be paired…

A statistical hypothesis is an assumption about a population parameter. For example, we may assume that the mean height of a male…