In a controlled study,if neither the subjects nor the investigators know which subjects are receiving treatment,the study is called a(n)

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In a double blind study, both the subjects receiving treatment and the investigators responsible for evaluating the outcomes are unaware of which subjects are receiving the treatment and which are receiving a placebo or alternative treatment. This helps to minimize potential biases and ensure the validity of the study. A single blind study, on the other hand, only involves one group (either the subjects or the investigators) being unaware of the treatment assignments. Variable study and undirected study are not commonly used terms in research methodology.

In a Controlled Study,if Neither the Subjects nor the Investigators