Neither the subjects nor the experimenter recording the data knows which subjects belong to a particular group.This is an example of:

Question

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This is a double-blind experiment where neither the subjects nor the experimenter recording the data knows which subjects belong to a particular group. This helps to minimize bias and placebo effects. Option B (random assignment) is also important in experimental design, but it does not specifically apply to this scenario. Option A (confounding variable) and D (single-blind experiment) do not accurately describe the situation given in the question.

Neither the Subjects nor the Experimenter Recording the Data Knows