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Epidemiology Midterm 2 Questions and
Correct Answers/ Latest Update /
Already Graded
The high degree if validity in which type of study stems mainly from
the investigator's ability to randomize subjects to either the treatment
group or the comparison group and thereby control for distortions
produced by confounding variables?
Ans: Experimental Study
Which type of observational study examines one or more health
effects/outcomes of exposure to a single agent?
Ans: Cohort Study
The exposed group can also be referred to as which of the
following?
Ans: Index Group
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Which of the following is a method of sampling a population in
which researchers identify and enroll cases of disease and a sample
of the source population that gave rise to the cases?
Ans: Case-control Study
The main disadvantage of using which type of controls is the
difficulty in determining appropriate illnesses for inclusion?
Ans: Hospital and clinic controls
Which type of studies typically take a snapshot of a population at a
single point in time and therefore usually measures the disease
prevalence, exposure prevalence, or relationship between the two?
Ans: Cross Sectional Study
Which type of study evaluates an association using the population
rather than the individual as the unit of analysis?
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Ans: Ecological Study
Observational studies take advantage of the fact that people
expose themselves to noxious or healthy substances through their
personal habits.
Ans: True
Consider a cohort of 2,000 people, of whom 800 are smokers and
1,200 are non-smokers. The entire cohort is observed for 20 years,
and 100 participants develop lung cancer, of who 90 are smokers
and 10 are not.
What is the incidence rate of lung cancer for non-smokers in this
cohort per 1,000?
Epidemiology Midterm 2 Questions and
Correct Answers/ Latest Update /
Already Graded
The high degree if validity in which type of study stems mainly from
the investigator's ability to randomize subjects to either the treatment
group or the comparison group and thereby control for distortions
produced by confounding variables?
Ans: Experimental Study
Which type of observational study examines one or more health
effects/outcomes of exposure to a single agent?
Ans: Cohort Study
The exposed group can also be referred to as which of the
following?
Ans: Index Group
,2 | Page
Which of the following is a method of sampling a population in
which researchers identify and enroll cases of disease and a sample
of the source population that gave rise to the cases?
Ans: Case-control Study
The main disadvantage of using which type of controls is the
difficulty in determining appropriate illnesses for inclusion?
Ans: Hospital and clinic controls
Which type of studies typically take a snapshot of a population at a
single point in time and therefore usually measures the disease
prevalence, exposure prevalence, or relationship between the two?
Ans: Cross Sectional Study
Which type of study evaluates an association using the population
rather than the individual as the unit of analysis?
, 3 | Page
Ans: Ecological Study
Observational studies take advantage of the fact that people
expose themselves to noxious or healthy substances through their
personal habits.
Ans: True
Consider a cohort of 2,000 people, of whom 800 are smokers and
1,200 are non-smokers. The entire cohort is observed for 20 years,
and 100 participants develop lung cancer, of who 90 are smokers
and 10 are not.
What is the incidence rate of lung cancer for non-smokers in this
cohort per 1,000?
