ATI Community Health Proctored Exam Public
Health Nursing Population Health NGN Clinical
Judgment Official Practice Exam Actual Exam
2026/2027 with Detailed Rationales | Complete
Exam-Style Questions | Pass Guaranteed – A+
Graded
══════════════════════════════════════
SECTION 1: PUBLIC HEALTH FOUNDATIONS & EPIDEMIOLOGY Q1 – Q17
══════════════════════════════════════
Question 1 of 100
A public health nurse at the county health department is reviewing data from the past year.
There were 500 new cases of influenza in a county with a population of 250,000. The nurse
calculates the incidence rate to report to the state epidemiologist. What value should the
nurse report?
A. 2 cases per 1,000 population
B. 200 cases per 100,000 population ✓ CORRECT
C. 0.2% of the total population
D. 500 cases per 250,000 population
Correct Answer: B
Rationale: Incidence rate is calculated as new cases divided by the population at risk,
typically expressed per 100,000 population; 500 divided by 250,000 multiplied by 100,000
equals 200 cases per 100,000. Option A is incorrect because it underrepresents the standard
epidemiological reporting metric, which uses per 100,000 for communicable disease
surveillance. On the ATI exam, always express incidence and prevalence using standard public
health denominators rather than raw counts or percentages.
Question 2 of 100
During a community health fair, a nurse explains the three core functions of public health to a
group of nursing students. A student asks which core function includes conducting
community health assessments and monitoring health status. The nurse responds that this
activity falls under which core function?
,A. Assurance
B. Policy development
C. Assessment ✓ CORRECT
D. Health promotion
Correct Answer: C
Rationale: Assessment is one of the three core functions of public health and specifically
involves systematic data collection, monitoring health status, and identifying community
health needs through surveillance and epidemiological investigation. Assurance focuses on
ensuring that necessary services are available and accessible, while policy development
involves using assessment data to create health policies. The three core
functions—assessment, policy development, and assurance—form the foundation of all
public health practice and are frequently tested on ATI exams.
Question 3 of 100
A nurse epidemiologist is investigating an outbreak of foodborne illness at a local restaurant.
Among 80 patrons who ate the seafood salad, 60 developed gastroenteritis. Among 40
patrons who did not eat the seafood salad, 5 developed gastroenteritis. What is the attack
rate among those who ate the seafood salad?
A. 25%
B. 50%
C. 75% ✓ CORRECT
D. 87.5%
Correct Answer: C
Rationale: The attack rate is calculated as the number of new cases divided by the number of
people at risk, expressed as a percentage; 60 cases divided by 80 exposed individuals equals
75%. Option D is incorrect because it represents the proportion of all cases that ate the
seafood salad (60 of 65 total cases), which is not the attack rate. Attack rates are used in
outbreak investigations to identify the most likely source of exposure, and the food with the
highest attack rate is typically the implicated vehicle.
Question 4 of 100
A community health nurse is planning a tuberculosis screening program at a homeless
shelter where the prevalence of latent TB infection is known to be high. The nurse selects the
tuberculin skin test (TST) for screening. Which epidemiological measure best describes the
probability that a person with a positive TST truly has latent TB infection?
A. Sensitivity
B. Specificity
C. Positive predictive value ✓ CORRECT
,D. Negative predictive value
Correct Answer: C
Rationale: Positive predictive value is the proportion of positive test results that are true
positives, indicating the probability that a person with a positive test actually has the disease
in the screened population. Sensitivity measures the test's ability to correctly identify those
with the disease, while specificity measures the ability to correctly identify those without the
disease. In populations with high disease prevalence, such as this homeless shelter, the
positive predictive value of a screening test increases, making the TST more clinically useful
in this setting.
Question 5 of 100
During a routine home visit, a public health nurse notices that three children in the same
apartment complex have developed measles within the past 10 days. The nurse immediately
reports this to the health department. Which public health essential service is the nurse
primarily performing?
A. Enforce laws and regulations that protect health and ensure safety
B. Monitor health status to identify and solve community health problems ✓ CORRECT
C. Inform, educate, and empower people about health issues
D. Evaluate effectiveness, accessibility, and quality of personal and population-based health
services
Correct Answer: B
Rationale: Monitoring health status to identify and solve community health problems is the
first essential public health service, and reporting a cluster of measles cases represents
disease surveillance and outbreak detection. Option A involves regulatory enforcement,
which is not the primary activity in this scenario. The 10 essential public health services
provide the operational framework for public health practice, and surveillance is the
cornerstone that enables all other services to function effectively.
Question 6 of 100
A nurse is reviewing mortality data for a rural county and notes that the crude death rate is 12
per 1,000 population. The state epidemiologist asks the nurse to calculate the age-adjusted
death rate to compare this county with the state average. What is the primary purpose of age
adjustment in this analysis?
A. To determine the leading cause of death in the county
B. To eliminate the effect of age distribution differences between populations ✓ CORRECT
C. To calculate the years of potential life lost due to premature death
D. To identify which age group has the highest mortality rate
, Correct Answer: B
Rationale: Age adjustment eliminates the confounding effect of different age distributions
when comparing mortality rates between populations, allowing for fair comparisons between
the rural county and the state. Option A is incorrect because age adjustment does not identify
causes of death; it standardizes rates to a reference population. Crude rates can be
misleading when populations have different age structures, so age-adjusted rates are
essential for valid epidemiological comparisons in community health reports.
Question 7 of 100
A public health nurse is conducting an outbreak investigation of Salmonella infections at a
summer camp. The nurse creates an epidemic curve showing the number of cases by date of
symptom onset. The curve shows a rapid rise in cases over 2 days, followed by a gradual
decline over 5 days. This pattern is most consistent with which type of epidemic?
A. Point source outbreak ✓ CORRECT
B. Continuous common source outbreak
C. Propagated epidemic
D. Cyclical epidemic
Correct Answer: A
Rationale: A point source outbreak is characterized by a rapid increase in cases followed by a
gradual decline, typically reflecting a single common exposure such as a contaminated meal
served at the camp. A continuous common source outbreak would show a plateau rather
than a sharp peak, while a propagated epidemic would show successive waves of cases as
person-to-person transmission occurs. Epidemic curves are critical tools in outbreak
investigations because their shape provides immediate clues about the source and mode of
transmission.
Question 8 of 100
A community health nurse is analyzing data from the Behavioral Risk Factor Surveillance
System (BRFSS) to identify health trends in the state. The nurse notes that the prevalence of
diabetes has increased from 8% to 12% over the past 5 years. Which type of epidemiological
study design produces this type of population-level data?
A. Case-control study
B. Cohort study
C. Cross-sectional survey ✓ CORRECT
D. Randomized controlled trial
Correct Answer: C
Rationale: The BRFSS is a cross-sectional telephone survey that collects data on health
behaviors and conditions from a representative sample of adults at a single point in time,
Health Nursing Population Health NGN Clinical
Judgment Official Practice Exam Actual Exam
2026/2027 with Detailed Rationales | Complete
Exam-Style Questions | Pass Guaranteed – A+
Graded
══════════════════════════════════════
SECTION 1: PUBLIC HEALTH FOUNDATIONS & EPIDEMIOLOGY Q1 – Q17
══════════════════════════════════════
Question 1 of 100
A public health nurse at the county health department is reviewing data from the past year.
There were 500 new cases of influenza in a county with a population of 250,000. The nurse
calculates the incidence rate to report to the state epidemiologist. What value should the
nurse report?
A. 2 cases per 1,000 population
B. 200 cases per 100,000 population ✓ CORRECT
C. 0.2% of the total population
D. 500 cases per 250,000 population
Correct Answer: B
Rationale: Incidence rate is calculated as new cases divided by the population at risk,
typically expressed per 100,000 population; 500 divided by 250,000 multiplied by 100,000
equals 200 cases per 100,000. Option A is incorrect because it underrepresents the standard
epidemiological reporting metric, which uses per 100,000 for communicable disease
surveillance. On the ATI exam, always express incidence and prevalence using standard public
health denominators rather than raw counts or percentages.
Question 2 of 100
During a community health fair, a nurse explains the three core functions of public health to a
group of nursing students. A student asks which core function includes conducting
community health assessments and monitoring health status. The nurse responds that this
activity falls under which core function?
,A. Assurance
B. Policy development
C. Assessment ✓ CORRECT
D. Health promotion
Correct Answer: C
Rationale: Assessment is one of the three core functions of public health and specifically
involves systematic data collection, monitoring health status, and identifying community
health needs through surveillance and epidemiological investigation. Assurance focuses on
ensuring that necessary services are available and accessible, while policy development
involves using assessment data to create health policies. The three core
functions—assessment, policy development, and assurance—form the foundation of all
public health practice and are frequently tested on ATI exams.
Question 3 of 100
A nurse epidemiologist is investigating an outbreak of foodborne illness at a local restaurant.
Among 80 patrons who ate the seafood salad, 60 developed gastroenteritis. Among 40
patrons who did not eat the seafood salad, 5 developed gastroenteritis. What is the attack
rate among those who ate the seafood salad?
A. 25%
B. 50%
C. 75% ✓ CORRECT
D. 87.5%
Correct Answer: C
Rationale: The attack rate is calculated as the number of new cases divided by the number of
people at risk, expressed as a percentage; 60 cases divided by 80 exposed individuals equals
75%. Option D is incorrect because it represents the proportion of all cases that ate the
seafood salad (60 of 65 total cases), which is not the attack rate. Attack rates are used in
outbreak investigations to identify the most likely source of exposure, and the food with the
highest attack rate is typically the implicated vehicle.
Question 4 of 100
A community health nurse is planning a tuberculosis screening program at a homeless
shelter where the prevalence of latent TB infection is known to be high. The nurse selects the
tuberculin skin test (TST) for screening. Which epidemiological measure best describes the
probability that a person with a positive TST truly has latent TB infection?
A. Sensitivity
B. Specificity
C. Positive predictive value ✓ CORRECT
,D. Negative predictive value
Correct Answer: C
Rationale: Positive predictive value is the proportion of positive test results that are true
positives, indicating the probability that a person with a positive test actually has the disease
in the screened population. Sensitivity measures the test's ability to correctly identify those
with the disease, while specificity measures the ability to correctly identify those without the
disease. In populations with high disease prevalence, such as this homeless shelter, the
positive predictive value of a screening test increases, making the TST more clinically useful
in this setting.
Question 5 of 100
During a routine home visit, a public health nurse notices that three children in the same
apartment complex have developed measles within the past 10 days. The nurse immediately
reports this to the health department. Which public health essential service is the nurse
primarily performing?
A. Enforce laws and regulations that protect health and ensure safety
B. Monitor health status to identify and solve community health problems ✓ CORRECT
C. Inform, educate, and empower people about health issues
D. Evaluate effectiveness, accessibility, and quality of personal and population-based health
services
Correct Answer: B
Rationale: Monitoring health status to identify and solve community health problems is the
first essential public health service, and reporting a cluster of measles cases represents
disease surveillance and outbreak detection. Option A involves regulatory enforcement,
which is not the primary activity in this scenario. The 10 essential public health services
provide the operational framework for public health practice, and surveillance is the
cornerstone that enables all other services to function effectively.
Question 6 of 100
A nurse is reviewing mortality data for a rural county and notes that the crude death rate is 12
per 1,000 population. The state epidemiologist asks the nurse to calculate the age-adjusted
death rate to compare this county with the state average. What is the primary purpose of age
adjustment in this analysis?
A. To determine the leading cause of death in the county
B. To eliminate the effect of age distribution differences between populations ✓ CORRECT
C. To calculate the years of potential life lost due to premature death
D. To identify which age group has the highest mortality rate
, Correct Answer: B
Rationale: Age adjustment eliminates the confounding effect of different age distributions
when comparing mortality rates between populations, allowing for fair comparisons between
the rural county and the state. Option A is incorrect because age adjustment does not identify
causes of death; it standardizes rates to a reference population. Crude rates can be
misleading when populations have different age structures, so age-adjusted rates are
essential for valid epidemiological comparisons in community health reports.
Question 7 of 100
A public health nurse is conducting an outbreak investigation of Salmonella infections at a
summer camp. The nurse creates an epidemic curve showing the number of cases by date of
symptom onset. The curve shows a rapid rise in cases over 2 days, followed by a gradual
decline over 5 days. This pattern is most consistent with which type of epidemic?
A. Point source outbreak ✓ CORRECT
B. Continuous common source outbreak
C. Propagated epidemic
D. Cyclical epidemic
Correct Answer: A
Rationale: A point source outbreak is characterized by a rapid increase in cases followed by a
gradual decline, typically reflecting a single common exposure such as a contaminated meal
served at the camp. A continuous common source outbreak would show a plateau rather
than a sharp peak, while a propagated epidemic would show successive waves of cases as
person-to-person transmission occurs. Epidemic curves are critical tools in outbreak
investigations because their shape provides immediate clues about the source and mode of
transmission.
Question 8 of 100
A community health nurse is analyzing data from the Behavioral Risk Factor Surveillance
System (BRFSS) to identify health trends in the state. The nurse notes that the prevalence of
diabetes has increased from 8% to 12% over the past 5 years. Which type of epidemiological
study design produces this type of population-level data?
A. Case-control study
B. Cohort study
C. Cross-sectional survey ✓ CORRECT
D. Randomized controlled trial
Correct Answer: C
Rationale: The BRFSS is a cross-sectional telephone survey that collects data on health
behaviors and conditions from a representative sample of adults at a single point in time,
