Esperanza is in an experiment where subjects are given a drug that is supposed to make them feel less anxious. Neither Esperanza nor the researcher know what treatment she is receiving. This is known as a(n):

Question

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This is an example of a double-blind study, where neither the participants nor the researchers know who is receiving the actual treatment and who is receiving a placebo, to prevent bias in the results.

Esperanza Is in an Experiment Where Subjects Are Given a Drug