Below are three examples of famous studies. . In the Framingham Heart Study researchers have, to date, studied three generations of Framingham residents in order to understand the causes of heart disease and stroke. . The Nurses Health Studies, established in 1976, investigates risk factors for chronic diseases in women. The study has followed 280,000 male and female nurses to date. . The Black Women's Health Study seeks to understand why black women have higher rates of many illnesses like breast cancer and diabetes. The study has been following participants for more than 20 years. a) Are these examples of randomized experiments or observational studies? [ Select ] b) Are these prospective or retrospective studies? ~ [ Select ] Retrospective Study Prospective Study Previous FEB 27 A 20 # % * 4 5 O- 6 OO F D