Therapist Doe wants to determine if a newly developed meditation course improves student GPAs. His sample consists of 60 students who have recently entered an undergraduate program; 30 of them took the meditation course prior to the beginning of the semester, 30 did not. Dr. Doe has access to each subject's GPA.

a. IV(s):

b. IV(s) nominal, ordinal, interval or ratio?

c. DV(s):

d. DV(s) nominal, ordinal, interval or ratio?

e. Alt H:

f. null H:

g. how many levels in IV(s) h. population: