19. A researcher wishes to determine whether exercising at least three times a week is more effective than pharmaceuticals (antidepressants) or psychotherapy in addressing mental health issues. He randomly assigns 20 psychiatric patients to one of four treatment condi- tions and asks their self-reported depression at the moment on a scale of I (very depressed) to 15 (very happy). Test the null bypothesis that there is no difference between exercise, antidepressants, therapy, and the control group using sing the following data. Exercise Antidepressants Therapy Control 20. Does one's relationship status affect how many arson lakes in a year? Us- ing these data collected from samples of adults. (that status does not affect the number of vacation days taken). Ongoing Civil Union/ Single Relationship Married Separated Widowed/Divorced