What is wrong with the design of this study, given the hypothesis? (in other words, why is this study design inappropriate for testing the stated hypothesis)? Indicate what study design would work for evaluating this hypothesis. Hypothesis: Diets high in fruits, vegetables and low fat dairy products can reduce the risk of hypertension (high blood pressure) in women.
Study: A group of 500 women were placed on a diet high in fruits and vegetables and low fat dairy products for six months. At the completion of the study, their blood pressures were measured.