WGU C784 APPLIED HEALTHCARE
STATISTICS ULTIMATE PRACTICE EXAM
PACK 150 Q and AS WITH RATIONALES
2025 2026 EDITION
WGU C784: Applied Healthcare Statistics Practice Exam (Part
1)
1. A clinical quality improvement team at a regional hospital is
tracking the specific departments where medical errors occur
over a six-month period. The departments are categorized as
Emergency, Intensive Care, Pediatrics, Surgery, and Outpatient
Clinics. Which scale of measurement is being utilized for this
variable?
• A) Ordinal
• B) Interval
• C) Correct AnswerNominal
• D) Ratio
• Correct AnswerNominal
• Rationale: Nominal scales are used for mutually
exclusive, qualitative categories that have no inherent
mathematical ranking or numerical value. In this
scenario, hospital departments represent distinct named
groups without a natural order.
2. A nurse researcher records the triage priority levels of
incoming trauma patients using the Emergency Severity Index
(ESI), which ranks patient urgency from 1 (Most Urgent) to 5
,(Least Urgent). What is the highest level of measurement
represented by this data?
• A) Nominal
• B) Correct AnswerOrdinal
• C) Interval
• D) Ratio
• Correct AnswerOrdinal
• Rationale: Ordinal data represents categories that
have a clear, meaningful rank or ordering. However, the
mathematical distance between the ranks (e.g., the
difference between priority 1 and 2 compared to 3 and 4)
is unequal and cannot be precisely quantified.
3. In a study evaluating the efficacy of a new antihypertensive
medication, researchers measure the exact reduction in systolic
blood pressure in millimeters of mercury (mmHg) for 150
participants. What type of data scale does this quantitative
measurement represent?
• A) Nominal
• B) Ordinal
• C) Interval
• D) Correct AnswerRatio
• Correct AnswerRatio
• Rationale: Blood pressure measured in mmHg is ratio
data because it possesses a true, absolute zero point
(where a value of zero implies a complete absence of the
property being measured) and equal intervals between
units, allowing for meaningful mathematical ratios.
,4. A public health researcher calculates the average length of
stay (in days) for a sample of 250 patients admitted with
pneumonia. The distribution of the data is found to be heavily
skewed to the right due to a few patients who required
prolonged ventilator support. Which measure of central
tendency should the researcher report to best reflect the typical
length of stay?
• A) Mean
• B) Correct AnswerMedian
• C) Mode
• D) Standard Deviation
• Correct AnswerMedian
• Rationale: When a dataset is heavily skewed or
contains extreme outliers, the median is the most
appropriate measure of central tendency because it is
robust and unaffected by extreme values, unlike the mean
which is pulled in the direction of the skew.
5. A healthcare administrator is comparing the performance of
two physical therapy clinics. Both clinics have an identical
mean recovery time of 14 days for knee replacement patients.
However, Clinic A has a standard deviation of 1.5 days, while
Clinic B has a standard deviation of 5.2 days. What can the
administrator infer about Clinic B's patient outcomes?
• A) Clinic B is significantly faster at treating its patients
overall.
• B) Clinic B's recovery times are highly clustered around
the 14-day average.
• C) Correct AnswerClinic B has much higher
variability and less predictability in its recovery
times.
, • D) Clinic B has a distribution of data that is perfectly
symmetrical.
• Correct AnswerClinic B has much higher
variability and less predictability in its recovery
times.
• Rationale: Standard deviation measures the spread or
dispersion of data around the mean. A larger standard
deviation indicates that the individual data points vary
widely from the average, meaning Clinic B has a much
less predictable patient timeline than Clinic A.
6. An epidemiologist investigates an outbreak of foodborne
illness at a long-term care facility. On October 1st, there are 12
existing cases of gastrointestinal illness among the 120
residents. By October 15th, an additional 8 residents develop
the illness. What is the incidence rate of new cases during this
two-week period?
• A) 6.67%
• B) Correct Answer7.41%
• C) 10.00%
• D) 16.67%
• Correct Answer7.41%
• Rationale: Incidence measures only the new cases that
develop in a population at risk over a specific time frame.
The initial population at risk excludes the 12 already sick
residents (120 - 12 = 108). Therefore, the incidence rate is
calculated as 8 new cases divided by 108 at-risk
residents, which equals approximately 7.41%.
7. A hospital executive wants to determine the proportion of all
active oncology patients who currently smoke cigarettes on a
STATISTICS ULTIMATE PRACTICE EXAM
PACK 150 Q and AS WITH RATIONALES
2025 2026 EDITION
WGU C784: Applied Healthcare Statistics Practice Exam (Part
1)
1. A clinical quality improvement team at a regional hospital is
tracking the specific departments where medical errors occur
over a six-month period. The departments are categorized as
Emergency, Intensive Care, Pediatrics, Surgery, and Outpatient
Clinics. Which scale of measurement is being utilized for this
variable?
• A) Ordinal
• B) Interval
• C) Correct AnswerNominal
• D) Ratio
• Correct AnswerNominal
• Rationale: Nominal scales are used for mutually
exclusive, qualitative categories that have no inherent
mathematical ranking or numerical value. In this
scenario, hospital departments represent distinct named
groups without a natural order.
2. A nurse researcher records the triage priority levels of
incoming trauma patients using the Emergency Severity Index
(ESI), which ranks patient urgency from 1 (Most Urgent) to 5
,(Least Urgent). What is the highest level of measurement
represented by this data?
• A) Nominal
• B) Correct AnswerOrdinal
• C) Interval
• D) Ratio
• Correct AnswerOrdinal
• Rationale: Ordinal data represents categories that
have a clear, meaningful rank or ordering. However, the
mathematical distance between the ranks (e.g., the
difference between priority 1 and 2 compared to 3 and 4)
is unequal and cannot be precisely quantified.
3. In a study evaluating the efficacy of a new antihypertensive
medication, researchers measure the exact reduction in systolic
blood pressure in millimeters of mercury (mmHg) for 150
participants. What type of data scale does this quantitative
measurement represent?
• A) Nominal
• B) Ordinal
• C) Interval
• D) Correct AnswerRatio
• Correct AnswerRatio
• Rationale: Blood pressure measured in mmHg is ratio
data because it possesses a true, absolute zero point
(where a value of zero implies a complete absence of the
property being measured) and equal intervals between
units, allowing for meaningful mathematical ratios.
,4. A public health researcher calculates the average length of
stay (in days) for a sample of 250 patients admitted with
pneumonia. The distribution of the data is found to be heavily
skewed to the right due to a few patients who required
prolonged ventilator support. Which measure of central
tendency should the researcher report to best reflect the typical
length of stay?
• A) Mean
• B) Correct AnswerMedian
• C) Mode
• D) Standard Deviation
• Correct AnswerMedian
• Rationale: When a dataset is heavily skewed or
contains extreme outliers, the median is the most
appropriate measure of central tendency because it is
robust and unaffected by extreme values, unlike the mean
which is pulled in the direction of the skew.
5. A healthcare administrator is comparing the performance of
two physical therapy clinics. Both clinics have an identical
mean recovery time of 14 days for knee replacement patients.
However, Clinic A has a standard deviation of 1.5 days, while
Clinic B has a standard deviation of 5.2 days. What can the
administrator infer about Clinic B's patient outcomes?
• A) Clinic B is significantly faster at treating its patients
overall.
• B) Clinic B's recovery times are highly clustered around
the 14-day average.
• C) Correct AnswerClinic B has much higher
variability and less predictability in its recovery
times.
, • D) Clinic B has a distribution of data that is perfectly
symmetrical.
• Correct AnswerClinic B has much higher
variability and less predictability in its recovery
times.
• Rationale: Standard deviation measures the spread or
dispersion of data around the mean. A larger standard
deviation indicates that the individual data points vary
widely from the average, meaning Clinic B has a much
less predictable patient timeline than Clinic A.
6. An epidemiologist investigates an outbreak of foodborne
illness at a long-term care facility. On October 1st, there are 12
existing cases of gastrointestinal illness among the 120
residents. By October 15th, an additional 8 residents develop
the illness. What is the incidence rate of new cases during this
two-week period?
• A) 6.67%
• B) Correct Answer7.41%
• C) 10.00%
• D) 16.67%
• Correct Answer7.41%
• Rationale: Incidence measures only the new cases that
develop in a population at risk over a specific time frame.
The initial population at risk excludes the 12 already sick
residents (120 - 12 = 108). Therefore, the incidence rate is
calculated as 8 new cases divided by 108 at-risk
residents, which equals approximately 7.41%.
7. A hospital executive wants to determine the proportion of all
active oncology patients who currently smoke cigarettes on a
