I don't understand how to do T tests please help.

Independent Samples T-test

2.An investigator theorizes that people who participate in a regular program of exercise will have lower levels of anxiety than people who do not participate in a regular program of exercise.To test this idea the investigator randomly assigns 12 subjects to an exercise program for 10 weeks and 12 subjects to a non-exercise comparison group.Lower anxiety scores reflect lower levels of anxiety.Please test the investigator's theory using an alpha level of .05, two tailed.

Exercise Group: 18, 23, 21, 19, 17, 16, 20, 25, 18, 19, 23, 21

No-Exercise Group: 26, 28, 25, 24, 31, 29, 27, 28, 27, 25, 23, 28