Most of us have heard from one teacher or another that your first guess on a multiple choice questions is usually correct. The implication being that we shouldn't double guess our instincts when taking tests. However, I have often realized I got an answer incorrect earlier and gone back and changed it, only to feel mildly guilty or worried that I wasn't going with my "usually correct" first answer.
The Question: On multiple choice questions, is changing your answer to a question more likely to result in an incorrect answer than leaving it as you originally guessed?
(P.S. - For comments, do people agree with my interpretation of the claim, or do other people feel a different interpretation is correct?)