ACT Preparation / Unit 20 ACT 1918 short lesson, about 20 seconds
Blinding
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The idea
In a blinded study, subjects do not know which treatment they receive. In a double-blind study, the researchers working with them do not know either.
In practice
Neither the patients nor the nurses know whose pill is real until the study ends.
Where people slip
Researchers who know the treatment can, without meaning to, treat or judge subjects differently; double-blinding prevents that.
Your place on the trail
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