David and Alexandra both take part in a research study that is investigating the effects of sleep deprivation on reaction time.David is kept awake for 24 hours straight,while Alexandra follows her normal sleep routine.In this study,David is part of the

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David is kept awake for 24 hours straight, which means he is experiencing the manipulated variable (sleep deprivation), and therefore he is part of the experimental group. Alexandra, who follows her normal sleep routine, is the control group.

David and Alexandra Both Take Part in a Research Study