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 ...

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.

It has less statistical power than a paired t-test, and it discards any datum where the difference between pairs is zero, so there can be significant data loss when dealing with very granular data.

(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).

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 ...

A generalized paired t-test is developed and a numerical example is given. Applied Statistics of the Journal of the Royal Statistical Society was founded in 1952. It promotes papers that are driven by ...

Nathan M. VanHoudnos, Joel B. Greenhouse, On the Hedges Correction for a t-Test, Journal of Educational and Behavioral Statistics, Vol. 41, No. 4 (August 2016), pp. 392-419 ...