The paired samples t-test is a statistical test that determines whether there is a difference between two dependent groups. The paired samples t-test, or also known as the dependent t-test, tests whether the mean values of two dependent groups differ significantly from each other. It tests whether the mean values of the two groups differ.
t-Test Calculator
https://datatab.net/statistics-calculator/hypothesis-test/t-test
More information about the t test for dependent samples
https://datatab.net/tutorial/paired-t-test
Table of t-values
https://datatab.net/tutorial/t-distribution