In this blog you will find the correct answer of the Coursera quiz Epidemiology: The Basic Science of Public Health 3 mixsaver always try to bring the best blogs and best coupon codes
 

 

Week- 3

Module 3 Quiz

 

1. True or False: It is always ethical to randomly have the investigator assign exposures to study participants in experimental studies.

 

  • False
  • True

2. Which of the following studies is best described in this statement: “A study where the effectiveness of 2 different diabetes drugs are compared.”

 

  • cohort study
  • randomized controlled trial
  • cross-over clinical trial
  • intervention study
  • case-control study

3. Which of the following studies is best described in this statement: “A study where the participants receive one drug for heart disease and then later receive a different drug for heart disease.”

 

  • cross-over clinical trial
  • cohort study
  • randomized controlled trial
  • case-control study
  • intervention study

4. Which of the following best relates to equipoise?

 

  • use of a sham treatment that appears identical to the real treatment but lacks the treatment’s active agent
  • an uncertainty about the benefits/harms of the possible treatments or exposures
  • analysis of subjects according to their randomized treatment, regardless of whether they actually got or took the treatment
  • whether or not participants follow the treatment recommendations of the study

5. A cohort may be defined based on which of the following? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)

 

  • gender
  • race
  • geography
  • age
  • behavioral characteristics

6. Which of the following are disadvantages of cohort studies? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)

 

  • loss to follow-up
  • expensive
  • time-consuming to conduct
  • inefficient for rare outcomes
  • good for studying single outcomes only

7. True or False: The denominator for a measure of occurrence in a cohort study is always person-time since the study participants are followed through time.

 

  • True
  • False

8. The study population in a cohort study can be which of the following? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)

 

  • closed
  • open
  • dynamic (changing over time)
  • very large

9. Subjects are selected into case-control studies based on their:

 

  • health outcome and exposure status
  • health outcome or disease status
  • exposure status

10. True or False: In a case-control study it is possible to sample on exposure status.

 

  • True
  • False

11. Prostate cancer occurs mainly in older men. About 6 cases in 10 are diagnosed in men aged 65 or older, and it is rare before age 40. The average age at the time of diagnosis is about 67. (Source)

A case control study is conducted to determine the effect of fish oil consumption on prostate cancer in the state of Colorado. Which of the following would be an appropriate source population for this study?

 

  • The entire population of Colorado.
  • The entire population of men in Colorado.
  • The entire population of men in Colorado over the age of 50.

12. True or False: Hospital controls would be a good choice of control group to accurately represent the source population of prostate cancer cases for a study of the effect of fish oil consumption and prostate cancer.

 

  • True
  • False

13. Which of the following study designs is sometimes referred to as a “snapshot in time”?

 

  • Cross-sectional study
  • Intervention study
  • Time to treat study
  • Cohort study
  • Case-control study

14. Which of the following measures of occurrence are used for cross-sectional studies? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)

 

  • Risk
  • Time
  • Rate
  • Odds
  • Prevalence

15. Which of the following are ways in which cross-sectional studies can be used / conducted? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)

 

  • Characterize data on prevalence of an exposure as well as a health outcome
  • Study a population at a point in time
  • Study a population over a defined period of time
  • Only characterize the prevalence of a health outcome

16. Which of the following are possible uses of cross-sectional study results? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)

 

  • Evaluate the proportion of a population with the health outcome or risk factor of interest
  • Help with planning or administering preventative or health care services
  • Evaluate the risk of a population with the health outcome or risk factor of interest
  • Help with developing surveillance programs
  • Study a chronic health outcome lacking information on time of onset.

17. Aggregate level data provide information on which of the following? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)

 

  • The average exposure of the group, but not of individuals
  • The ability to link exposures and other risk factors to those who became diseased and those who did not
  • The health outcome rate of the group, but we don’t know exposures of individuals who became diseased and those who did not
  • Exposures of each person

18. True or False: The ecological fallacy is when you conclude that an association between exposure and the health outcome at individual level is true at group level when this may not be true.

 

  • False
  • True

19. Which of the following conclusions to explain the hypothetical statement that “Air pollution is higher in New York City than in Washington D.C., but mortality from lung disease is lower in New York City than in Washington D.C.” would be an example of ecologic fallacy?

 

  • Air pollution protects against lung disease deaths
  • New York City may provide better treatment for lung disease than Washington D.C.
  • Persons dying of lung disease in Washington D.C. may have moved from high air pollution cities
  • People in New York City may have better health insurance than people in Washington D.C.

20. Which of the following are advantages of ecologic studies? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)

 

  • Help conservationists understand ecological principles
  • Convenience
  • Low cost
  • Useful for evaluating impact of community-level interventions
  • Individual-level data on exposure and health outcomes are often publicly available in state and national data bases

 

 

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