You and your friend share a package of candies. You eat twice as many candies as your friend. If there were 36 candies in the bag how many did you eat?

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?