Dr Alberts designs a research study in which neither the subjects nor the individuals who interact directly with the subjects know which is the control group and which is the experimental group in the study. Dr Alberts probably chose this type of research design in order to

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Dr Alberts chose this type of research design, which is called a double-blind study, in order to reduce the impact of experimenter bias. By keeping both the subjects and those interacting with them unaware of which group they belong to, the experimenter's expectations or beliefs cannot influence the results. This increases the validity and reliability of the study's findings.

Dr Alberts Designs a Research Study in Which Neither the Subjects