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Jonathan is conducting a study that examines the effects of personality and social media usage on life satisfaction. She has each participant take a measure of personality. Each participant is also instructed to avoid using social media for one week. Participants then complete a life satisfaction questionnaire. Afterward, they are instructed to begin using social media again for another week. They then complete another questionnaire. This is an example of a _______ design.
A. Within-Subjects Design
B. Factorial Design
C. Mixed-Factorial Design
D. Between-Subjects Design
E. Random Assignment