Dr Jayden Is Studying the Effect of Exercise on Cholesterol

Dr. Jayden is studying the effect of exercise on cholesterol level. He first measures his patients' cholesterol level before recommending an exercise program and after one month of participating in an exercise program, he measures their cholesterol level again. What type of research design has Dr. Jayden employed?

A) Between groups design
B) One-shot case study
C) Missing control group design
D) One group pretest-posttest design

Correct Answer:

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