t STUDENT. Google Play

The Student t test is used for comparing the means of two small samples (here, with sizes from 2 to 60).

To enter or change a text or a value, press on it, introduce the new text or value, and press again on it to make effective the change

Once data are been introduced, press button ONE TAIL or button TWO TAILS to obtain the results.
Use TWO TAILS if your work hypothesis is validated with deviations in any of the two directions.
Use ONE TAIL if your work hypothesis is validated only in one direction (p.e. You expect an improvement of patients after the treatment)