For a project, Mr. Green's physics students made rockets. During class last week, the students launched their rockets from the bleachers of the school's outdoor football stadium. The bleacher location where Martin launched his rocket was 48 feet off the ground. The height of Martin's rocket in feet, t seconds after launch, is shown by the function below. h(t) = -16t+88t+48

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?