Applying Statistical Inference: an Example All of These Illustrate a Directional

Applying Statistical Inference: An Example All of these illustrate a directional hypothesis except:

A) Behavior therapy combined with antidepressant medication produces greater improvement in depressive symptoms than behavior therapy
Alone.
B) EEG biofeedback combined with a traditional 12-step program produces a higher abstinence rate in alcoholics than a traditional 12-step program
Alone.
C) Students experience more colds during midterms than the rest of the semester.
D) The risk of heart attack differs for patients who exercise or who are sedentary.