When neither the subjects nor the experimenters know which group has received a treatment and which has not,the design is called:

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In a double-blind study, neither the subjects nor the experimenters know which group has received a treatment and which has not. This eliminates any potential biases or effects from the experimenter or the subjects' expectations, leading to more objective and reliable results. Single-blind studies, on the other hand, only have one of the parties blind to the treatment assignment (usually the subjects), while naturalistic and retrospective designs are different types of observational studies that do not involve experimental manipulation of variables.

When Neither the Subjects nor the Experimenters Know Which Group