Key Points A t-statistic is performed during a t-test. The resulting statistic is used to determine whether to accept or reject a null hypothesis. The core use of this statistic is for direct ...

What is a one sample t test? The t test is a commonly used hypothesis test in statistics that allows us to compare the mean value of a group of sampled data with some hypothesized value, usually a ...

(Statistical software can handle unequal variances for the two-sample t-test module, but the actual calculations are complex and beyond the scope of this article).

Learn what a t-test is and discover the five standard assumptions made regarding the validity of sampling and data used in a t-test.

This short course provides an overview of statistical analyses useful for comparing the means for one or more samples. The statistical training will include the discussion of the one sample t-test, ...

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 Annals of Statistics and The Annals of Probability (which supersede The Annals of Mathematical Statistics), Statistical Science, and The Annals of Applied Probability are the scientific journals ...

The size and power of Student's t-test are discussed under weaker than normal conditions. It is shown that assuming only a symmetry condition for the null hypothesis leads to effective bounds on the ...