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To continue with our story, these participants are randomly assigned to either

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the control group, where they take the placebo pill, or the experimental group,

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where they take the active pill. They take the pill at the same time of day, on

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the same day, and the same place. And then, they all go to bed in a sleep lab at

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the same time. While sleeping, researchers observe the particpant's sleep

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patterns and rate their quality of sleep. Do you think these researchers should

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or should not know which treatment participants received? Why or why not? Yes,

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because their ratings will depend on which treatment the people received. No, to

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help maintain participant confidentiality. Yes, because the researchers ratings

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will be more accurate. Or no, because if they know, their judgements may be

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biased. What do you think?