Four subjects participated in an experiment to compare three methods of relieving stress. Each subject was placed in a stressful situation on three different occasions. Each time a different method for reducing stress was used with the subject. The response variable is the amount of decrease in stress level as measured before and after treatment application. The results were as follows:

Treatment Subject A B C 1 16 26 22 2 16 20 23 3 17 21 22 4 28 29 36 Can we conclude from these data that the three methods differ in effectiveness? Let a ¼ :05.