NR503 Exam 2 Actual Exam Style V1 | NR
503 Population Health, Epidemiology &
Statistical Principles | Chamberlain
1. Which term describes the number of new cases of a disease that occur during a specified
period in a population at risk?
A. Prevalence
B. Mortality
C. Morbidity
D. Incidence
Correct Answer: D
Expert Explanation: Incidence focuses specifically on new cases appearing within a
certain timeframe. This measure is essential for understanding the risk of developing a
condition. It differs from prevalence, which looks at all existing cases in the population.
2. A nurse practitioner is screening a patient for hypertension. This activity represents which
level of prevention?
A. Primary Prevention
B. Secondary Prevention
C. Tertiary Prevention
D. Primordial Prevention
,Correct Answer: B
Expert Explanation: Secondary prevention focuses on early detection and prompt
intervention to halt the progress of a disease. Screening tests like blood pressure checks
are classic examples of this level. It aims to identify asymptomatic individuals who may
have the condition.
3. What is the primary purpose of a Randomized Controlled Trial (RCT)?
A. To describe the frequency of a disease
B. To observe the natural history of a condition
C. To test the efficacy of an intervention
D. To identify rare side effects in the general population
Correct Answer: C
Expert Explanation: RCTs are considered the gold standard for evaluating the
effectiveness of a treatment or intervention. By using randomization, the study minimizes
bias between the experimental and control groups. This design allows researchers to make
stronger claims about cause and effect.
4. In epidemiology, the ‘Epidemiologic Triangle’ consists of which three components?
A. Agent, Host, Environment
B. Doctor, Patient, Hospital
C. Bacteria, Virus, Parasite
, D. Time, Place, Person
Correct Answer: A
Expert Explanation: The Epidemiologic Triangle is a fundamental model used to explain
the spread of infectious diseases. The Agent is the cause, the Host is the organism affected,
and the Environment includes external factors. Disease occurs when these three factors
interact in a specific way.
5. Which statistical measure refers to the ability of a test to correctly identify those who have
the disease?
A. Specificity
B. Positive Predictive Value
C. Sensitivity
D. Reliability
Correct Answer: C
Expert Explanation: Sensitivity is the proportion of actual positives that are correctly
identified by the test. A highly sensitive test will have very few false negatives. This is a
critical metric for screening programs where missing a case could be dangerous.
6. What does a ‘p-value’ of 0.03 indicate in a research study?
A. The results are statistically significant at the 0.05 level
B. The results are not statistically significant
503 Population Health, Epidemiology &
Statistical Principles | Chamberlain
1. Which term describes the number of new cases of a disease that occur during a specified
period in a population at risk?
A. Prevalence
B. Mortality
C. Morbidity
D. Incidence
Correct Answer: D
Expert Explanation: Incidence focuses specifically on new cases appearing within a
certain timeframe. This measure is essential for understanding the risk of developing a
condition. It differs from prevalence, which looks at all existing cases in the population.
2. A nurse practitioner is screening a patient for hypertension. This activity represents which
level of prevention?
A. Primary Prevention
B. Secondary Prevention
C. Tertiary Prevention
D. Primordial Prevention
,Correct Answer: B
Expert Explanation: Secondary prevention focuses on early detection and prompt
intervention to halt the progress of a disease. Screening tests like blood pressure checks
are classic examples of this level. It aims to identify asymptomatic individuals who may
have the condition.
3. What is the primary purpose of a Randomized Controlled Trial (RCT)?
A. To describe the frequency of a disease
B. To observe the natural history of a condition
C. To test the efficacy of an intervention
D. To identify rare side effects in the general population
Correct Answer: C
Expert Explanation: RCTs are considered the gold standard for evaluating the
effectiveness of a treatment or intervention. By using randomization, the study minimizes
bias between the experimental and control groups. This design allows researchers to make
stronger claims about cause and effect.
4. In epidemiology, the ‘Epidemiologic Triangle’ consists of which three components?
A. Agent, Host, Environment
B. Doctor, Patient, Hospital
C. Bacteria, Virus, Parasite
, D. Time, Place, Person
Correct Answer: A
Expert Explanation: The Epidemiologic Triangle is a fundamental model used to explain
the spread of infectious diseases. The Agent is the cause, the Host is the organism affected,
and the Environment includes external factors. Disease occurs when these three factors
interact in a specific way.
5. Which statistical measure refers to the ability of a test to correctly identify those who have
the disease?
A. Specificity
B. Positive Predictive Value
C. Sensitivity
D. Reliability
Correct Answer: C
Expert Explanation: Sensitivity is the proportion of actual positives that are correctly
identified by the test. A highly sensitive test will have very few false negatives. This is a
critical metric for screening programs where missing a case could be dangerous.
6. What does a ‘p-value’ of 0.03 indicate in a research study?
A. The results are statistically significant at the 0.05 level
B. The results are not statistically significant
