Weighing the Evidence Dr

Multiple Choice

Weighing the Evidence Dr.L.compared the effectiveness of EEG biofeedback and stimulant medication in treating Attention Deficit Disorder with Hyperactivity.He assessed 40 teenage subjects using DSM-IV criteria and then randomly assigned them to either EEG biofeedback with stimulant medication or stimulant medication alone.The subjects were treated for 9 months and then reassessed.Since the EEG biofeedback with stimulant medication group showed greater symptom reduction than the stimulant medication only group, he

A) concluded that both groups were sampled from the same population.
B) rejected the alternative hypothesis.
C) rejected the null hypothesis.
D) rejected the research hypothesis.