If you are concerned that your researcher might actually influence the outcome of your experiment,you should conduct a

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A blind experiment is the best choice in this situation as it prevents the researcher's bias from affecting the outcomes. In a blind experiment, the participants are not aware of which group they belong to (treatment or control) and the researcher does not know which participants belong to which group, making it less likely that the researcher's bias will influence the results. This helps ensure the reliability and validity of the experiment's results. A placebo pre-trial, manipulation check, and correlational study are useful in other situations but may not address the issue of the researcher's bias.

If You Are Concerned That Your Researcher Might Actually Influence