The best way to exclude biases in an experiment is to randomize the design. Both the individuals and treatments are assigned randomly.
A double-blind experiment is one in which neither the subjects nor the experimenter know which individuals got which treatment until the experiment is completed.
- Another way to make sure your conclusions are robust is to replicate your experiment—do it over. Replication ensures that particular results are not due to uncontrolled factors or
- errors of manipulation.