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An experiment is run to test the effectiveness of a new vaccine. One hundred participants are randomly selected to receive the new vaccine, and 100

An experiment is run to test the effectiveness of a new vaccine. One hundred participants are randomly selected to receive the new vaccine, and 100 participants are randomly selected to receive the old vaccine. Neither the participants nor the researchers are aware of which vaccine the participants are given. What is the purpose of keeping the participants unaware of which vaccine they receive? To prevent them from giving informed consent To prevent malpractice suits To eliminate the placebo effect To prevent injury

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