A researcher is determining if exercising 3 times a week is more effective than pharmaceuticals or psychotherapy. A total of 20 psychiatric patients were assigned to one of four treatment conditions and asked self-reported depression on a scale of 1 (depressed) to 15 (happy). Test the null hypothesis that there is no difference between exercise, antidepressants, therapy, and the control group using the following data. Please show steps to retrieve answer:

Treatment	n	sample mean	sd
Exercise	5	9	2.5
Antidepressants	5	10	2
Therapy	5	9	2
Control	5	7.5	2