Dr. Rodgers believes that people under high stress are more likely to develop cardiovascular disease. When he randomly selects 30 participants who have high-stress jobs, he finds that 26 of the participants develop cardiovascular disease. Based on the results Dr. Rodgers concludes that stress causes an increase in the incidence of cardiovascular disease. His reasoning is flawed because in this study:

Question

Quizplus · Accepted Answer

The absence of a control group for comparison means that Dr. Rodgers cannot rule out other possible causes of cardiovascular disease in the high-stress participants. Therefore, he cannot conclude that stress is the sole cause of the increased incidence of cardiovascular disease.

Dr Rodgers Believes That People Under High Stress Are More