7 which of the following is an advantage of a

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7. Which of the following is an advantage of a prospective cohort study? a. Most of them are relatively inexpensive and quick to conduct. b. They are ideal for rare outcomes that have a long latency period. c. People are less likely to be lost to follow up. d. It can establish temporality (meaning that the exposure preceded the outcome).- this is the only answer that is an advantage. Cohort studies are not cheap in quick. They are not ideal for rare outcomes, but they can be used for them. A disadvantage is loss to followup.
8. Suppose researchers want to address the question of whether new car safety features such as multiple airbags have made a difference in motor vehicle fatality rates. Which of the following study designs would best address that question?
9. 90,000 healthy women enrolled in a study to examine environmental effects and cardiovascular disease. All women had given blood samples at the start of the study. After the women were followed for 10 years, 1200 cases of breast cancer had developed. Investigators selected a random sample of 1200 women without breast cancer from the base population of 90,000 women. The blood samples of the 1200 women with breast cancer and the 1200 women without breast cancer were analyzed to determine the presence of DDT (a persistent environmental pesticide). What type of study design is described?
10. Which of the following is not a method of probability sampling?

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