he tank. Had he done one or more of these things, he might have biased the results.</p>
<p>A paradigmatic example of an experiment is a randomized-control trial, as common in studies assessing the effectiveness of medication or other therapeutic interventions. In such experiments, a sample of participants is taken from a population of interest, and each participant is randomly assigned to either an experimental condition or control condition. For example, participants in the experimental condition might be 