In Dr.Turgrove's experiment,he includes a control group that receives a placebo.This type of research design is meant to control which confound?

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By including a control group that receives a placebo, Dr. Turgrove is controlling for participants' expectations. If the control group had no treatment at all, participants might behave differently simply because they believe they are receiving a treatment, rather than solely because of the actual treatment. The placebo control group helps to ensure that any observed effects are due to the independent variable and not due to participant expectations.

In DrTurgrove's Experiment,he Includes a Control Group That Receives a Placebo