To study the potential effects of social isolation on blood pressure,some research participants were instructed to solve problems while working together while others solved problems while working alone.Those who worked alone were assigned to the:

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The control group is the group that does not receive the treatment or intervention being studied. In this case, the participants who worked alone were not instructed to solve problems while working together, so they are the control group.

To Study the Potential Effects of Social Isolation on Blood