What is an example of over confidence interfereing with a researchers study.

The overconfidence effect is a well-established bias in which a person's subjective confidence in his or her judgements is reliably greater than the objective accuracy of those judgements, especially when confidence is relatively high.

what is an example of over confidence interfering with a researchers study?

An example of over confidence interfering with a researchers study is when researcher tends not take replicates of experiment carried out and this replicates validates or increases the chances of accuracy of research studies