the study is setup so that the person taking the pill and the person giving it to the participant who is recording the results both don’t know whether the pill is a placebo, but some other person knows or it’s written somewhere else what the person got so in the end they can know if the result was from placebo. the important part is the researcher at the time of recording/interpreting doesn’t know, because if they know they may be bias in favor or against the placebo.
the study is setup so that the person taking the pill and the person giving it to the participant who is recording the results both don’t know whether the pill is a placebo, but some other person knows or it’s written somewhere else what the person got so in the end they can know if the result was from placebo. the important part is the researcher at the time of recording/interpreting doesn’t know, because if they know they may be bias in favor or against the placebo.