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In a single blind study, the subject being studied does not know whether he is part of the experimental group or control group, but the researcher recording the results does know. In a double blind, neither the subject nor the observer knows to which group in the experiment the subject belongs.

A double-blind study is a research design where neither the participants nor the researchers know who is receiving the treatment and who is receiving a placebo. This helps to reduce bias in the study results by preventing expectations from influencing the outcomes.

The study is called a double-blind study. This helps to reduce bias and ensure that the results of the study are not influenced by the expectations or beliefs of either the subjects or the experimenters.