Why is it necessary to be able to replicate the results of a scientific experiment?

Question

farmdawgnation · Answer

The replication of an experiment significantly reduces the probability that a certain result set was achieved by pure chance of experimenter error.

anonymous · Answer

To ensure that the results are always consistent with your understanding of nature (either via a proposed hypothesis or currently accepted law).

rsmith6559 · Answer

It's really just a formal requirement that you've probably done casually.

Have you ever walked out after a test and asked someone what answer they had for question whatever?  If they got the same answer, your confidence in your answer goes way up, your result was replicated!