Caiden got on a elevator and he forgot what floor he was going to so he pressed the last floor. The elevator ascended 12 floors, then descended 5 floors. Before Caided realized where he was, the elavator ascended 8 floors and Caiden got off. On what floor did Caiden get off

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?