A t-test is an inferential statistic used in hypothesis testing to determine if there is a statistically significant difference between the means of two samples.

T-Distribution: This type of sampling distribution is common in cases of small sample sizes. ... T-Test: What It Is With Multiple Formulas and When to Use Them.

Robustness and Power of the t-Test This applet allows users to change the distributions of two populations, and to view the resulting distribution of test statistics arising from simulation results.