WGU C784 Applied Healthcare Statistics Objective Assessment
(OA) – 2026/2027 Academic Year | Comprehensive Study Guide &
Practice Questions with Answers | Healthcare Statistics, Data
Analysis & Research Methods
WGU C784 APPLIED HEALTHCARE
STATISTICS
OBJECTIVE ASSESSMENT PRACTICE EXAM
2026/2027 | Original Practice Questions
Higher Education Healthcare Analytics Curriculum | Applied Statistics, Data Analysis,
and Evidence-Based Interpretation
150 Questions | 2026/2027 Applied Healthcare Statistics Review
Introduction
This 150-question original WGU C784 Applied Healthcare Statistics practice examination covers descriptive
statistics, probability, sampling and study design, confidence intervals, hypothesis testing, correlation and regression,
interpretation of statistical output, and healthcare-focused data analysis. The questions are designed to strengthen
applied statistical reasoning, calculation skills, interpretation of results, and evidence-based decision-making for
learners preparing for an Applied Healthcare Statistics objective assessment.
Practice Questions
Domain: Descriptive Statistics and Data Summaries
1. What is the mean of 10, 20, 30, 40, and 50?
A. 20
B. 25
C. 30
D. 35
Correct Answer: C
Rationale: Add the five values and divide by 5: 150/5 = 30.
2. Which measure is most resistant to extreme values?
A. Mean
B. Median
C. Variance
D. Standard deviation
Correct Answer: B
Rationale: The median depends on ordered position and is less influenced by extreme observations.
WGU C784 APPLIED HEALTHCARE STATISTICS 2026/2027 | Original Practice Questions
,3. What does the range measure?
A. Maximum minus minimum
B. Mean minus median
C. Q1 plus Q3
D. Standard error
Correct Answer: A
Rationale: Range is calculated as the maximum value minus the minimum value.
4. What is the square root of variance called?
A. Median
B. Standard deviation
C. Percentile
D. Mode
Correct Answer: B
Rationale: Standard deviation is the positive square root of variance.
5. A value is 70, the mean is 60, and the standard deviation is 5. What is its z-score?
A. 1
B. 2
C. 5
D. 10
Correct Answer: B
Rationale: The z-score is (70−60)/5 = 2.
6. Which graph is generally appropriate for a continuous variable such as blood pressure?
A. Histogram
B. Pie chart
C. Flowchart
D. Organizational chart
Correct Answer: A
Rationale: A histogram displays the frequency distribution of a quantitative continuous variable.
7. Which statistic describes the middle 50% of ordered data?
A. Range
B. Interquartile range
C. Mean
D. Mode
Correct Answer: B
Rationale: The interquartile range is Q3 minus Q1 and represents the central half of the distribution.
8. In a right-skewed distribution, which relationship is commonly expected?
A. Mean greater than median
B. Mean always equals median
C. Mean less than median
D. No possible relationship
Correct Answer: A
Rationale: A long right tail tends to pull the mean upward relative to the median.
9. What does a percentile describe?
A. Position relative to an ordered distribution
B. The sample variance
C. The study alpha
D. The regression intercept
Correct Answer: A
WGU C784 APPLIED HEALTHCARE STATISTICS 2026/2027 | Original Practice Questions
, Rationale: A percentile indicates the percentage of observations at or below a specified value.
10. A dataset has 4, 6, 8, 10, 12. What is the median?
A. 6
B. 7
C. 8
D. 10
Correct Answer: C
Rationale: The ordered middle value is 8.
Domain: Probability, Sampling, and Study Design
11. What is the complement of an event with probability 0.30?
A. 0.03
B. 0.30
C. 0.70
D. 1.30
Correct Answer: C
Rationale: The complement is 1 − 0.30 = 0.70.
12. Why use random sampling?
A. Reduce selection bias
B. Guarantee significance
C. Eliminate measurement error
D. Guarantee a normal distribution
Correct Answer: A
Rationale: Random selection can improve representativeness and reduce systematic selection bias.
13. Selecting every tenth patient after a random starting point is:
A. Stratified sampling
B. Cluster sampling
C. Systematic sampling
D. Convenience sampling
Correct Answer: C
Rationale: Systematic sampling selects observations at a fixed interval after a suitable random start.
14. Sampling patients from each age stratum is:
A. Stratified sampling
B. Cluster sampling
C. Convenience sampling
D. Census
Correct Answer: A
Rationale: Stratified sampling divides the population into strata and samples within each group.
15. Randomly selecting hospitals and surveying all eligible staff in selected hospitals is:
A. Cluster sampling
B. Systematic sampling
C. Snowball sampling
D. Simple random sampling
Correct Answer: A
Rationale: Hospitals act as selected clusters, with members within selected clusters included.
16. What is a population parameter?
A. Numerical characteristic of a population
B. Numerical characteristic of a sample only
WGU C784 APPLIED HEALTHCARE STATISTICS 2026/2027 | Original Practice Questions
(OA) – 2026/2027 Academic Year | Comprehensive Study Guide &
Practice Questions with Answers | Healthcare Statistics, Data
Analysis & Research Methods
WGU C784 APPLIED HEALTHCARE
STATISTICS
OBJECTIVE ASSESSMENT PRACTICE EXAM
2026/2027 | Original Practice Questions
Higher Education Healthcare Analytics Curriculum | Applied Statistics, Data Analysis,
and Evidence-Based Interpretation
150 Questions | 2026/2027 Applied Healthcare Statistics Review
Introduction
This 150-question original WGU C784 Applied Healthcare Statistics practice examination covers descriptive
statistics, probability, sampling and study design, confidence intervals, hypothesis testing, correlation and regression,
interpretation of statistical output, and healthcare-focused data analysis. The questions are designed to strengthen
applied statistical reasoning, calculation skills, interpretation of results, and evidence-based decision-making for
learners preparing for an Applied Healthcare Statistics objective assessment.
Practice Questions
Domain: Descriptive Statistics and Data Summaries
1. What is the mean of 10, 20, 30, 40, and 50?
A. 20
B. 25
C. 30
D. 35
Correct Answer: C
Rationale: Add the five values and divide by 5: 150/5 = 30.
2. Which measure is most resistant to extreme values?
A. Mean
B. Median
C. Variance
D. Standard deviation
Correct Answer: B
Rationale: The median depends on ordered position and is less influenced by extreme observations.
WGU C784 APPLIED HEALTHCARE STATISTICS 2026/2027 | Original Practice Questions
,3. What does the range measure?
A. Maximum minus minimum
B. Mean minus median
C. Q1 plus Q3
D. Standard error
Correct Answer: A
Rationale: Range is calculated as the maximum value minus the minimum value.
4. What is the square root of variance called?
A. Median
B. Standard deviation
C. Percentile
D. Mode
Correct Answer: B
Rationale: Standard deviation is the positive square root of variance.
5. A value is 70, the mean is 60, and the standard deviation is 5. What is its z-score?
A. 1
B. 2
C. 5
D. 10
Correct Answer: B
Rationale: The z-score is (70−60)/5 = 2.
6. Which graph is generally appropriate for a continuous variable such as blood pressure?
A. Histogram
B. Pie chart
C. Flowchart
D. Organizational chart
Correct Answer: A
Rationale: A histogram displays the frequency distribution of a quantitative continuous variable.
7. Which statistic describes the middle 50% of ordered data?
A. Range
B. Interquartile range
C. Mean
D. Mode
Correct Answer: B
Rationale: The interquartile range is Q3 minus Q1 and represents the central half of the distribution.
8. In a right-skewed distribution, which relationship is commonly expected?
A. Mean greater than median
B. Mean always equals median
C. Mean less than median
D. No possible relationship
Correct Answer: A
Rationale: A long right tail tends to pull the mean upward relative to the median.
9. What does a percentile describe?
A. Position relative to an ordered distribution
B. The sample variance
C. The study alpha
D. The regression intercept
Correct Answer: A
WGU C784 APPLIED HEALTHCARE STATISTICS 2026/2027 | Original Practice Questions
, Rationale: A percentile indicates the percentage of observations at or below a specified value.
10. A dataset has 4, 6, 8, 10, 12. What is the median?
A. 6
B. 7
C. 8
D. 10
Correct Answer: C
Rationale: The ordered middle value is 8.
Domain: Probability, Sampling, and Study Design
11. What is the complement of an event with probability 0.30?
A. 0.03
B. 0.30
C. 0.70
D. 1.30
Correct Answer: C
Rationale: The complement is 1 − 0.30 = 0.70.
12. Why use random sampling?
A. Reduce selection bias
B. Guarantee significance
C. Eliminate measurement error
D. Guarantee a normal distribution
Correct Answer: A
Rationale: Random selection can improve representativeness and reduce systematic selection bias.
13. Selecting every tenth patient after a random starting point is:
A. Stratified sampling
B. Cluster sampling
C. Systematic sampling
D. Convenience sampling
Correct Answer: C
Rationale: Systematic sampling selects observations at a fixed interval after a suitable random start.
14. Sampling patients from each age stratum is:
A. Stratified sampling
B. Cluster sampling
C. Convenience sampling
D. Census
Correct Answer: A
Rationale: Stratified sampling divides the population into strata and samples within each group.
15. Randomly selecting hospitals and surveying all eligible staff in selected hospitals is:
A. Cluster sampling
B. Systematic sampling
C. Snowball sampling
D. Simple random sampling
Correct Answer: A
Rationale: Hospitals act as selected clusters, with members within selected clusters included.
16. What is a population parameter?
A. Numerical characteristic of a population
B. Numerical characteristic of a sample only
WGU C784 APPLIED HEALTHCARE STATISTICS 2026/2027 | Original Practice Questions
