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02-During a clinical trial on a new type of anti-depressant, one group of participants is given a placebo while the other group was given the

02-During a clinical trial on a new type of anti-depressant, one group of participants is given a placebo while the other group was given the actual drug. The participants are not told which they were given. The researchers are also not told which group got which treatment. What does this example illustrate?

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