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.

Question

Quizplus · Accepted Answer

The study design involved testing the effectiveness of two different treatments on two groups of subjects. The null hypothesis would be that there is no difference between the treatments in terms of symptom reduction. The research hypothesis would be that one treatment is more effective than the other. Since the EEG biofeedback with stimulant medication group showed greater symptom reduction than the stimulant medication only group, it would be appropriate to reject the null hypothesis and conclude that EEG biofeedback with stimulant medication is more effective than stimulant medication alone.