double-blind study
EXPERIMENT IN WHICH INFORMATION ABOUT THE TEST IS MASKED TO REDUCE BIAS
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исследование (эксперимент), предусматривающее, что ни участники эксперимента, ни лицо, ответственное за сбор и регистрацию данных, не знают, кто находится в экспериментальной, а кто в контрольной группе.