Do SAT coaching classes work? Do they help students to improve their test scores? 8 students were randomly assigned to complete an SAT coaching class or receive no coaching.

Not coached 880 920 830 960 910 770 960

Coached 980 840 1000 1010 800 1000 980

To determine if the mean scores differ, we should use the:
A)	one-samplet test.
B)	matched pairst test.
C)	two-sample ttest.
D)	Any of the above is valid. It just needs to use the tdistribution because is unknown.