The t-test for independent samples tests whether the mean values of two independent groups differ significantly. Independent samples exist if no case or person from one group can be assigned to a case or person from the other group. The t-test for independent samples is also called the two-sample t-test or unpaired t-test.
The online statistics calculator:
https://datatab.net/statistics-calculator/hypothesis-test
More information about the unpaired t-test:
https://datatab.net/tutorial/unpaired-t-test
paired t-test:
https://datatab.net/tutorial/paired-t-test
and the Video:
https://youtu.be/mjJ4zx1gZoM
One sample t-test:
https://datatab.net/tutorial/one-sample-t-test