A researcher is interested in the effects of two new drugs, Drug A and Drug B, on learning. She has a

group of 5 people take Drug A and then work on a learning task. One month later, the same 5 people

take Drug B and then work on the same learning task as before. The number of errors made on the

learning task after taking each drug is recorded below. Using an alpha of .01, test for a difference

between the groups.