Dr. Richards wants to discover whether his new medication is going to be effective for treating depression. In order to best eliminate his own biases as well as the biases of the participants he should:
Obtain informed consent from all participants.
Make sure that participants are aware they may be deceived.
Conduct a double-blind study in which neither the participants nor the researchers know who is in the control and experimental groups.
Conduct a blind study in which the participants are unaware of whether they are in the control or experimental group.
Use random assignment to create a control and an experimental group.