a racecar at the sonoma county raceway in california zips around the track. it travels the first 80 kilometers in .4 hour. the next 114 kilometers take .6 hours. the following 80 kilometers take .4 hours

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?