MPH 6011 Second Half Quizzes ECU Questions with Complete Solutions Which of the following statements is true about analytic and descriptive epidemiology (select only one)? - Correct Answers ✅Analytic epidemiology compares health events between two or more groups to identify causes of those health events *Both analytic and descriptive focus on health events, but only analytic epidemiology focuses on comparisons between groups to identify causes or risk factors of those health events. Analytic studies can utilize either a representative or a purposively selected population.A study of the association between smoking and incidence lung cancer among British doctors in the 1950s would use purposive sampling to select study participants. - Correct Answers ✅True *This is an etiologic question, so it will always be purposive sampling because the sample of British doctors must all be disease free and thus the study sample may not fully represent all British doctors since some of them will have lung cancer A study of the mean age at first sex among US adolescents would use which type of sampling? - Correct Answers ✅Representative sampling 1 / 3
MPH 6011 Second Half Quizzes ECU Questions with Complete Solutions *The mean of something in a population is a population parameter for which we want our sample to be representative of the total population A design feature in experimental studies that creates equal probability in treatment assignment is what? - Correct Answers ✅randomization *Not all intervention studies will include randomization.However, only experimental intervention studies utilize randomization as a design feature that give allocation into two treatment groups equal probability, which removes any influence of confounding or bias and makes the groups similar to each other.One purpose of randomization is to eliminate differences in measured and unmeasured characteristics between the treated and untreated groups in the study. - Correct Answers ✅True *The primary purpose of randomization is to make treated and control groups similar to each other in all measured and unmeasured characteristics. A second purpose is to eliminate conscious bias due to selecting who belongs in each group.A research study recruited 100 study participants to compare a new, injectable medication to the standard oral form of the 2 / 3
MPH 6011 Second Half Quizzes ECU Questions with Complete Solutions medication. Participants were randomized into one of the two groups (injection or oral). After randomization, 30% of the injection group was male and the average age was 40 years old. In the oral group, 50% were male and the average age was 35 years old. Which of the following statements is likely true? (select all that apply) - Correct Answers ✅The randomization process did not balance the groups Differences between the two groups is entirely due to chance
The primary purpose of a double blind study is to: - Correct
Answers ✅Avoid provider bias and participant bias Fluoride was introduced into the water supply of Town A on January 1, 2000. A study was conducted to compare new occurrence of cavities in children ages 3-10 years living in two towns (Town A and Town B). The towns are located 10 miles apart. New Cavities in children were measured 5 years after fluoride was introduced into the water supply. Fluoride in water reduced cavities. What is the best answer for the type
of study design: - Correct Answers ✅Natural experiment
A study on the prevalence of diabetes is conducted by randomly selecting 500 people from Pitt county and measuring A1c levels to determine the prevalence of diabetes. What is being described? - Correct Answers ✅taking a simple random sample
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