NR503 Exam 4 Actual Exam Style V2 | NR
503 Population Health, Epidemiology &
Statistical Principles | Chamberlain
1. A nurse practitioner is reviewing a study that measures the number of new cases of
diabetes in a city over the past year. Which epidemiological measure is being reported?
A. Incidence
B. Prevalence
C. Attack Rate
D. Point Prevalence
Correct Answer: A
Expert Explanation: Incidence specifically tracks the number of new cases of a disease
that develop in a population during a defined period. This differs from prevalence, which
accounts for both new and existing cases within the population. Monitoring incidence is
essential for identifying trends in disease transmission and assessing the impact of
preventive interventions.
2. In a diagnostic test evaluation, sensitivity is defined as which of the following?
A. The ability of a test to correctly identify those without the disease.
B. The probability that a patient with a positive test actually has the disease.
C. The probability that a patient with a negative test does not have the disease.
,D. The ability of a test to correctly identify those with the disease.
Correct Answer: D
Expert Explanation: Sensitivity measures the proportion of actual positives that are
correctly identified by the test. A test with high sensitivity is useful for screening because it
minimizes the number of false negatives. This ensures that most individuals with the
condition are captured for further evaluation or treatment.
3. A study reports a p-value of 0.02. What does this value indicate regarding the null
hypothesis?
A. There is a 2% chance that the results are due to random error, and the null hypothesis is
rejected.
B. The null hypothesis should be accepted.
C. The results are not statistically significant.
D. The effect size is large enough to be clinically significant regardless of sample size.
Correct Answer: A
Expert Explanation: A p-value of 0.02 is below the conventional alpha level of 0.05,
meaning the results are statistically significant. This suggests that the observed effect is
unlikely to have occurred by chance alone if the null hypothesis were true. Consequently,
researchers reject the null hypothesis in favor of the alternative hypothesis.
, 4. Which level of prevention is illustrated by providing cardiac rehabilitation to a patient who
has recently suffered a myocardial infarction?
A. Primary Prevention
B. Secondary Prevention
C. Tertiary Prevention
D. Quaternary Prevention
Correct Answer: C
Expert Explanation: Tertiary prevention focuses on managing disease post-diagnosis to
slow or stop disease progression and improve quality of life. Cardiac rehabilitation helps
patients recover and prevents future cardiac events through controlled exercise and
education. Unlike primary or secondary prevention, the goal here is to reduce the impact of
an established condition.
5. An investigator compares a group of patients with lung cancer to a group of similar
individuals without lung cancer to look for past smoking habits. What type of study design is
this?
A. Prospective Cohort Study
B. Case-Control Study
C. Randomized Controlled Trial
D. Cross-sectional Study
503 Population Health, Epidemiology &
Statistical Principles | Chamberlain
1. A nurse practitioner is reviewing a study that measures the number of new cases of
diabetes in a city over the past year. Which epidemiological measure is being reported?
A. Incidence
B. Prevalence
C. Attack Rate
D. Point Prevalence
Correct Answer: A
Expert Explanation: Incidence specifically tracks the number of new cases of a disease
that develop in a population during a defined period. This differs from prevalence, which
accounts for both new and existing cases within the population. Monitoring incidence is
essential for identifying trends in disease transmission and assessing the impact of
preventive interventions.
2. In a diagnostic test evaluation, sensitivity is defined as which of the following?
A. The ability of a test to correctly identify those without the disease.
B. The probability that a patient with a positive test actually has the disease.
C. The probability that a patient with a negative test does not have the disease.
,D. The ability of a test to correctly identify those with the disease.
Correct Answer: D
Expert Explanation: Sensitivity measures the proportion of actual positives that are
correctly identified by the test. A test with high sensitivity is useful for screening because it
minimizes the number of false negatives. This ensures that most individuals with the
condition are captured for further evaluation or treatment.
3. A study reports a p-value of 0.02. What does this value indicate regarding the null
hypothesis?
A. There is a 2% chance that the results are due to random error, and the null hypothesis is
rejected.
B. The null hypothesis should be accepted.
C. The results are not statistically significant.
D. The effect size is large enough to be clinically significant regardless of sample size.
Correct Answer: A
Expert Explanation: A p-value of 0.02 is below the conventional alpha level of 0.05,
meaning the results are statistically significant. This suggests that the observed effect is
unlikely to have occurred by chance alone if the null hypothesis were true. Consequently,
researchers reject the null hypothesis in favor of the alternative hypothesis.
, 4. Which level of prevention is illustrated by providing cardiac rehabilitation to a patient who
has recently suffered a myocardial infarction?
A. Primary Prevention
B. Secondary Prevention
C. Tertiary Prevention
D. Quaternary Prevention
Correct Answer: C
Expert Explanation: Tertiary prevention focuses on managing disease post-diagnosis to
slow or stop disease progression and improve quality of life. Cardiac rehabilitation helps
patients recover and prevents future cardiac events through controlled exercise and
education. Unlike primary or secondary prevention, the goal here is to reduce the impact of
an established condition.
5. An investigator compares a group of patients with lung cancer to a group of similar
individuals without lung cancer to look for past smoking habits. What type of study design is
this?
A. Prospective Cohort Study
B. Case-Control Study
C. Randomized Controlled Trial
D. Cross-sectional Study
