What do you have to do to replicate an experiment?

1. You do the same experiment several times.

   No. Doing the same experiment several times is repetition, not replication.

2. You do the same experiment that someone else did.

   Yes. By replicating an experiment exactly, you should get the same results as the original experiment.

3. You do an improved version of someone's experiment.

   For replication, you do the experiment exactly as the original scientist did, without making any changes.

4. You look for errors in someone's experiment.

   The purpose of replication is to verify, not to look for errors.

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