C228- WGU chapter 9 questions with
correct answers
Agent - correct answer ✔✔An animate or inanimate factor that must be present or lacking for a disease
or condition to develop.
analytic epidemiology - correct answer ✔✔Focus on investigation of causes and associations
Attack rate - correct answer ✔✔The proportion of persons who are exposed to an agent and develop the
disease.
Bias - correct answer ✔✔A systematic error as a result of the study design, the wayit is conducted.
case- countrol study - correct answer ✔✔Subjects are enrolled because they are known to have the
outcome of interest.
case fatality rate - correct answer ✔✔percentage of population that dies from a specific disease who die
within a specific period.
causal inference - correct answer ✔✔Using epidemiologic, clinical, statistical, and other scientific
evidence to judge if a causal association exists between two or more factors or events. Guidelines for
evaluation of evidence are often used in making causal inference. Different levels of evidence may be
required for different settings, for example, clinical decisions versus policy determinations.
cohort study - correct answer ✔✔Epidemiological study design in which subjects without an outcome of
interest are classified according to past or present (or future) exposures or characteristics and followed
over time to observe and compare the rates of some health outcome in the various exposure groups.
Confounding - correct answer ✔✔Bias that results from the relationship between both the outcome and
study factor (exposure or characteristic) and some third factor not accounted for in analysis.
correct answers
Agent - correct answer ✔✔An animate or inanimate factor that must be present or lacking for a disease
or condition to develop.
analytic epidemiology - correct answer ✔✔Focus on investigation of causes and associations
Attack rate - correct answer ✔✔The proportion of persons who are exposed to an agent and develop the
disease.
Bias - correct answer ✔✔A systematic error as a result of the study design, the wayit is conducted.
case- countrol study - correct answer ✔✔Subjects are enrolled because they are known to have the
outcome of interest.
case fatality rate - correct answer ✔✔percentage of population that dies from a specific disease who die
within a specific period.
causal inference - correct answer ✔✔Using epidemiologic, clinical, statistical, and other scientific
evidence to judge if a causal association exists between two or more factors or events. Guidelines for
evaluation of evidence are often used in making causal inference. Different levels of evidence may be
required for different settings, for example, clinical decisions versus policy determinations.
cohort study - correct answer ✔✔Epidemiological study design in which subjects without an outcome of
interest are classified according to past or present (or future) exposures or characteristics and followed
over time to observe and compare the rates of some health outcome in the various exposure groups.
Confounding - correct answer ✔✔Bias that results from the relationship between both the outcome and
study factor (exposure or characteristic) and some third factor not accounted for in analysis.
