What is used to control for the experimenter's expectation in an experiment?
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In the experiment described in Exercise 1, explain why it is necessary that a participant does not know to which group he or she belongs.
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What is the function of a control in an experiment?
A double-blind procedure is often used to prevent a researcher's biases from influencing the outcome of an experiment. In this procedure a. only the participants will know whether they are in the control group or the experimental group. b. members of the experimental and control groups will be carefully matched to be sure they have the same age, $\operatorname{sex},$ income, and level of education. c. neither the participants nor the researchers will know who is in the experimental and control groups. d. someone separate from the researcher will ask people to volunteer for either the experimental group or the control group.
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