Suppose you are the director of a tutoring agency and you want to determine if students who prepare for a particular standardized test with your agency do better on the test than students who do not use your tutoring services. You obtain standardized test scores from students at three different universities who did and did not prepare through your agency. The type of design (matrix) described is a:

Group of answer choices

2 x 2

2 x 3

3 x 3

None of the above