When you find yourself taking a test, say a multiple choice exam, and you come back to a question that you had answered previously but you are thinking that now it'll be time to change that answer to something else. You really aren't too sure though. What do you do?
Well, in many instances your first instinct is wrong. On average, test takers most often change their answers from incorrect to correct.
Contrary to popular belief you may be better off changing your answer than going with your initial instinct.
The reason people think that staying with your first choice is better is because people are more likely to remember changing an answer from right to wrong than from wrong to right. The action resulting in a negative consequence will loom larger in our memory.
Source: Psychology Today