The rest of the article, however, discusses understanding the two-sample t-test, which is easy to use but not so easy to understand. If one subtracts the means from two samples, in most cases ...

A t-test for population means compares the means between two populations. It is appropriate when the population standard deviations are unknown. This applet allows users to change the distributions of ...

The data are provided in the Analyst Sample Library. To access this Analyst sample data set, follow these steps: The test of interest ... difference between the means is not equal to the specified ...