A dynamic population is one that adds new members through immigration and births and loses members through emigration and deaths.




Question 24

Descriptive epidemiology characterizes the amount and distribution of disease within a population to enable the epidemiologist to:


Test hypotheses regarding causality of disease

Generate testable hypotheses regarding etiology

Evaluate trends in health and disease within a population

The 2nd and 3rd answers only

All of the above

Question 25

When interpreting public health data from different sources, it is important to consider:


The amount of missing data

The population covered

Any changes in data collection methods

The 2nd and 3rd answers only

The 1st and 3rd answers only

All of the above

Question 26

A study collects information on occupation and blood pressure among current Mass Turnpike toll booth collectors and current Turnpike office workers. What type of study is this?


Case report

Case series

Ecological study

Cross-sectional study

Question 27

27)The Health Professionals Cohort Study began in 2005 in order to evaluate a series of hypotheses about men’s health relating nutritional factors to the incidence of serious illnesses such as cancer, heart disease, and other vascular diseases. Every two years, members of the study will receive surveys with questions about diseases and health-related topics like smoking, physical activity, and medications taken. The surveys that ask detailed dietary information will be administered in four-year intervals. What kind of cohort study is this?





Question 28

Selection bias is most likely to occur in which type of study?


Prospective cohort studies

Retrospective cohort studies

Case-control studies

Both the 2nd and 3rd answers


Question 29

Interviewer/recording bias can occur in


Case-control studies only

Cohort studies only

Experimental studies only

Any type of epidemiologic study

Question 30

Differential misclassification can bias study results in which direction?


Toward the null

Away from the null

Either toward or away from the null