WGU C784 (APPLIED HEALTHCARE STATISTICS) OBJECTIVE ASSESSMENT EXAM
PRACTICE — COMPREHENSIVE STUDY GUIDE, FULL TESTBANK & 150 PRACTICE
QUESTIONS WITH 100% CORRECT ANSWERS AND RATIONALES — 2026/2027
LATEST UPDATE
I. Fundamental Mathematics and Algebra
II. Statistical Concepts and Data Types
III. Descriptive Statistics
IV. Probability and Counting
V. Probability Distributions
VI. Sampling and Study Design
VII. Correlation and Regression
VIII. Statistical Interpretation and Decision-Making
IX. Healthcare Applications and Data Analysis
X. Advanced Integrated Review
DESCRIPTION
This comprehensive WGU C784 Applied Healthcare Statistics practice examination
is designed to strengthen mathematical reasoning, statistical interpretation,
probability, regression, correlation, research design, and healthcare data analysis.
It targets students preparing for an objective assessment who need more than
simple memorization. The questions emphasize application, calculations,
interpretation, scenario-based reasoning, study validity, and evidence-based
decision-making. The testbank contains 150 advanced practice questions and
answers with concise rationales covering foundational through challenging
concepts. It is suitable for structured review, final preparation, competency
checking, and identifying knowledge gaps. Purchase and instantly get a
downloadable and editable PDF for convenient study, revision, and offline
practice.
QUESTION 1
A healthcare analyst records the number of emergency-department visits made by
each patient during a six-month period. Which type of variable is being measured?
A. Continuous quantitative variable
B. Discrete quantitative variable
C. Nominal qualitative variable
D. Ordinal qualitative variable
,🔴 Correct Answer: B. Discrete quantitative variable.
🔵 Explanation: The number of visits is a count and therefore can take only whole-
number values, making it a discrete quantitative variable.
QUESTION 2
A researcher records patients' blood types as A, B, AB, or O. Which measurement
scale is most appropriate?
A. Ratio
B. Interval
C. Ordinal
D. Nominal
🔴 Correct Answer: D. Nominal.
🔵 Explanation: Blood types are categories without an inherent ranking or
numerical distance, so they are nominal.
QUESTION 3
A patient's temperature rises from 37°C to 39°C. Which statement correctly
describes the change?
A. The temperature increased by 2°C
B. The temperature doubled
C. The temperature increased by 5.4%
D. The temperature increased by 39°C
🔴 Correct Answer: A. The temperature increased by 2°C.
🔵 Explanation: The absolute change is 39 − 37 = 2°C. A Celsius temperature is not
appropriately interpreted as a ratio scale.
QUESTION 4
A clinic reports that the average waiting time is 18 minutes with a standard
deviation of 4 minutes. Assuming the distribution is approximately normal, which
interval represents approximately 95% of observations?
A. 14 to 22 minutes
B. 10 to 26 minutes
C. 6 to 30 minutes
D. 16 to 20 minutes
,🔴 Correct Answer: B. 10 to 26 minutes.
🔵 Explanation: Approximately 95% of normally distributed observations lie within
two standard deviations of the mean: 18 ± 2(4) = 10 to 26.
QUESTION 5
A dataset contains the values 4, 6, 8, 10, and 12. What is the arithmetic mean?
A. 7
B. 8
C. 9
D. 10
🔴 Correct Answer: B. 8.
🔵 Explanation: The sum is 40 and there are five observations, so the mean is 40/5
= 8.
QUESTION 6
A dataset contains 3, 7, 9, 12, and 20. Which measure represents the median?
A. 7
B. 9
C. 10.2
D. 12
🔴 Correct Answer: B. 9.
🔵 Explanation: The observations are already ordered, and the middle value of five
observations is 9.
QUESTION 7
A distribution of hospital charges is strongly right-skewed because a small number
of patients incur extremely high charges. Which measure is generally most
resistant to this skew?
A. Mean
B. Median
C. Variance
D. Standard deviation
🔴 Correct Answer: B. Median.
🔵 Explanation: The median is resistant to extreme observations, whereas the mean
and measures based on squared deviations are more affected by very large charges.
, QUESTION 8
A dataset has a mean of 50 and a standard deviation of 10. A patient-related
measurement is 70. What is its z-score?
A. −2
B. −1
C. 1
D. 2
🔴 Correct Answer: D. 2.
🔵 Explanation: z = (70 − 50)/10 = 2, meaning the observation is two standard
deviations above the mean.
QUESTION 9
Two datasets have the same mean, but Dataset A has a standard deviation of 3
and Dataset B has a standard deviation of 12. Which statement is most accurate?
A. Dataset A has greater variability
B. Dataset B has greater variability
C. Both have identical variability
D. Standard deviation cannot measure variability
🔴 Correct Answer: B. Dataset B has greater variability.
🔵 Explanation: A larger standard deviation indicates that observations are more
dispersed around the mean.
QUESTION 10
A healthcare researcher wants to compare the variability of two measures
expressed in very different units. Which statistic is particularly useful for comparing
relative variability?
A. Median
B. Interquartile range
C. Coefficient of variation
D. Range
🔴 Correct Answer: C. Coefficient of variation.
🔵 Explanation: The coefficient of variation expresses standard deviation relative to
the mean, allowing relative variability to be compared across differently scaled
measurements.
PRACTICE — COMPREHENSIVE STUDY GUIDE, FULL TESTBANK & 150 PRACTICE
QUESTIONS WITH 100% CORRECT ANSWERS AND RATIONALES — 2026/2027
LATEST UPDATE
I. Fundamental Mathematics and Algebra
II. Statistical Concepts and Data Types
III. Descriptive Statistics
IV. Probability and Counting
V. Probability Distributions
VI. Sampling and Study Design
VII. Correlation and Regression
VIII. Statistical Interpretation and Decision-Making
IX. Healthcare Applications and Data Analysis
X. Advanced Integrated Review
DESCRIPTION
This comprehensive WGU C784 Applied Healthcare Statistics practice examination
is designed to strengthen mathematical reasoning, statistical interpretation,
probability, regression, correlation, research design, and healthcare data analysis.
It targets students preparing for an objective assessment who need more than
simple memorization. The questions emphasize application, calculations,
interpretation, scenario-based reasoning, study validity, and evidence-based
decision-making. The testbank contains 150 advanced practice questions and
answers with concise rationales covering foundational through challenging
concepts. It is suitable for structured review, final preparation, competency
checking, and identifying knowledge gaps. Purchase and instantly get a
downloadable and editable PDF for convenient study, revision, and offline
practice.
QUESTION 1
A healthcare analyst records the number of emergency-department visits made by
each patient during a six-month period. Which type of variable is being measured?
A. Continuous quantitative variable
B. Discrete quantitative variable
C. Nominal qualitative variable
D. Ordinal qualitative variable
,🔴 Correct Answer: B. Discrete quantitative variable.
🔵 Explanation: The number of visits is a count and therefore can take only whole-
number values, making it a discrete quantitative variable.
QUESTION 2
A researcher records patients' blood types as A, B, AB, or O. Which measurement
scale is most appropriate?
A. Ratio
B. Interval
C. Ordinal
D. Nominal
🔴 Correct Answer: D. Nominal.
🔵 Explanation: Blood types are categories without an inherent ranking or
numerical distance, so they are nominal.
QUESTION 3
A patient's temperature rises from 37°C to 39°C. Which statement correctly
describes the change?
A. The temperature increased by 2°C
B. The temperature doubled
C. The temperature increased by 5.4%
D. The temperature increased by 39°C
🔴 Correct Answer: A. The temperature increased by 2°C.
🔵 Explanation: The absolute change is 39 − 37 = 2°C. A Celsius temperature is not
appropriately interpreted as a ratio scale.
QUESTION 4
A clinic reports that the average waiting time is 18 minutes with a standard
deviation of 4 minutes. Assuming the distribution is approximately normal, which
interval represents approximately 95% of observations?
A. 14 to 22 minutes
B. 10 to 26 minutes
C. 6 to 30 minutes
D. 16 to 20 minutes
,🔴 Correct Answer: B. 10 to 26 minutes.
🔵 Explanation: Approximately 95% of normally distributed observations lie within
two standard deviations of the mean: 18 ± 2(4) = 10 to 26.
QUESTION 5
A dataset contains the values 4, 6, 8, 10, and 12. What is the arithmetic mean?
A. 7
B. 8
C. 9
D. 10
🔴 Correct Answer: B. 8.
🔵 Explanation: The sum is 40 and there are five observations, so the mean is 40/5
= 8.
QUESTION 6
A dataset contains 3, 7, 9, 12, and 20. Which measure represents the median?
A. 7
B. 9
C. 10.2
D. 12
🔴 Correct Answer: B. 9.
🔵 Explanation: The observations are already ordered, and the middle value of five
observations is 9.
QUESTION 7
A distribution of hospital charges is strongly right-skewed because a small number
of patients incur extremely high charges. Which measure is generally most
resistant to this skew?
A. Mean
B. Median
C. Variance
D. Standard deviation
🔴 Correct Answer: B. Median.
🔵 Explanation: The median is resistant to extreme observations, whereas the mean
and measures based on squared deviations are more affected by very large charges.
, QUESTION 8
A dataset has a mean of 50 and a standard deviation of 10. A patient-related
measurement is 70. What is its z-score?
A. −2
B. −1
C. 1
D. 2
🔴 Correct Answer: D. 2.
🔵 Explanation: z = (70 − 50)/10 = 2, meaning the observation is two standard
deviations above the mean.
QUESTION 9
Two datasets have the same mean, but Dataset A has a standard deviation of 3
and Dataset B has a standard deviation of 12. Which statement is most accurate?
A. Dataset A has greater variability
B. Dataset B has greater variability
C. Both have identical variability
D. Standard deviation cannot measure variability
🔴 Correct Answer: B. Dataset B has greater variability.
🔵 Explanation: A larger standard deviation indicates that observations are more
dispersed around the mean.
QUESTION 10
A healthcare researcher wants to compare the variability of two measures
expressed in very different units. Which statistic is particularly useful for comparing
relative variability?
A. Median
B. Interquartile range
C. Coefficient of variation
D. Range
🔴 Correct Answer: C. Coefficient of variation.
🔵 Explanation: The coefficient of variation expresses standard deviation relative to
the mean, allowing relative variability to be compared across differently scaled
measurements.
