WGU C784 Applied Healthcare Statistics
Actual Exam 2026/2027 | Verified
Questions
Western Governors University (WGU) | Verified Q&A |
Professional Healthcare and Nursing Students
This document contains 70 original questions developed to reinforce the official course objectives of Western
Governors University (WGU) C784 Applied Healthcare Statistics. The questions address Descriptive Statistics and
Data Visualization, Probability and Sampling Distributions, Inferential Statistics and Hypothesis Testing, and
Regression, Correlation, and Statistical Software Application. Content is designed to support professional
competency and actual exam readiness for Professional Healthcare and Nursing Students. All material is original
and aligned with WGU C784 course materials, foundational biostatistics principles, and current healthcare data
analysis standards for the 2026/2027 cycle.
Domain: Descriptive Statistics and Data Visualization
1. Which measure of central tendency is most appropriate for a skewed distribution of hospital
length-of-stay data?
A. Mean
B. Median
C. Mode only
D. Range
Correct Answer: C
Rationale: The median is resistant to extreme values and is preferred for skewed continuous data such as length of stay.
2. What does a standard deviation of zero indicate about a set of numerical observations?
A. All observations are identical
B. The data are highly variable
C. The mean is zero
D. The distribution is normal
Correct Answer: D
Rationale: A standard deviation of zero occurs only when every value in the data set is the same.
3. Which graphical display is most appropriate for showing the distribution of a single continuous
variable such as patient age?
A. Bar chart of frequencies for categories
B. Histogram or box plot
C. Pie chart only
D. Scatter plot of two variables
Correct Answer: C
Rationale: Histograms and box plots are designed to display the distribution of a continuous variable.
4. In a box plot, what do the ends of the “whiskers” typically represent?
A. The minimum and maximum values within a defined multiple of the interquartile range, or the actual
extremes if no outliers are present
B. The mean ± one standard deviation
C. The 5th and 95th percentiles only
D. The mode of the data
WGU C784 Applied Healthcare Statistics Actual Exam 2026/2027 | Verified Questions
, Correct Answer: B
Rationale: Whiskers extend to the most extreme observations within a specified distance (commonly 1.5 × IQR) of the
quartiles.
5. What is the interquartile range (IQR)?
A. The difference between the third quartile (Q3) and the first quartile (Q1)
B. The difference between the maximum and minimum values
C. The average of the mean and median
D. The standard deviation multiplied by 1.5
Correct Answer: A
Rationale: IQR = Q3 − Q1 and measures the spread of the middle 50% of the data.
6. Which measure of variability is most sensitive to extreme outliers?
A. Interquartile range
B. Range
C. Median absolute deviation
D. Mode
Correct Answer: D
Rationale: The range uses the most extreme values and is therefore highly sensitive to outliers.
7. When is the mode the preferred measure of central tendency?
A. For nominal or categorical data where the most frequent category is of interest
B. For every continuous skewed distribution
C. Only when the mean and median are equal
D. Never in healthcare data
Correct Answer: A
Rationale: The mode identifies the most common category and is the only measure of central tendency defined for nominal
data.
8. What does a right-skewed (positively skewed) distribution look like?
A. A long tail extending to the right, with the mean typically greater than the median
B. A long tail extending to the left, with the mean less than the median
C. Perfect symmetry around the mean
D. A uniform rectangular shape
Correct Answer: B
Rationale: Positive skew is characterized by a longer right tail and a mean pulled toward the higher values.
9. Which of the following is an example of a continuous variable in healthcare data?
A. Blood pressure (mm Hg)
B. Blood type (A, B, AB, O)
C. Number of hospital admissions (count)
D. Gender (male/female)
Correct Answer: A
Rationale: Blood pressure can take any value within a range and is measured on a continuous scale.
10. What is the primary advantage of a stem-and-leaf plot compared with a histogram?
A. It preserves the actual data values while still showing the overall distribution
B. It requires no ordering of the data
C. It is useful only for categorical data
D. It cannot display outliers
Correct Answer: B
Rationale: Stem-and-leaf plots retain individual observations, allowing both distribution shape and exact values to be
examined.
11. In a frequency distribution, what does a relative frequency represent?
A. The proportion or percentage of observations falling into a particular category or interval
B. The absolute count of observations in a category
C. The cumulative total of all previous categories
D. The difference between consecutive frequencies
WGU C784 Applied Healthcare Statistics Actual Exam 2026/2027 | Verified Questions
Actual Exam 2026/2027 | Verified
Questions
Western Governors University (WGU) | Verified Q&A |
Professional Healthcare and Nursing Students
This document contains 70 original questions developed to reinforce the official course objectives of Western
Governors University (WGU) C784 Applied Healthcare Statistics. The questions address Descriptive Statistics and
Data Visualization, Probability and Sampling Distributions, Inferential Statistics and Hypothesis Testing, and
Regression, Correlation, and Statistical Software Application. Content is designed to support professional
competency and actual exam readiness for Professional Healthcare and Nursing Students. All material is original
and aligned with WGU C784 course materials, foundational biostatistics principles, and current healthcare data
analysis standards for the 2026/2027 cycle.
Domain: Descriptive Statistics and Data Visualization
1. Which measure of central tendency is most appropriate for a skewed distribution of hospital
length-of-stay data?
A. Mean
B. Median
C. Mode only
D. Range
Correct Answer: C
Rationale: The median is resistant to extreme values and is preferred for skewed continuous data such as length of stay.
2. What does a standard deviation of zero indicate about a set of numerical observations?
A. All observations are identical
B. The data are highly variable
C. The mean is zero
D. The distribution is normal
Correct Answer: D
Rationale: A standard deviation of zero occurs only when every value in the data set is the same.
3. Which graphical display is most appropriate for showing the distribution of a single continuous
variable such as patient age?
A. Bar chart of frequencies for categories
B. Histogram or box plot
C. Pie chart only
D. Scatter plot of two variables
Correct Answer: C
Rationale: Histograms and box plots are designed to display the distribution of a continuous variable.
4. In a box plot, what do the ends of the “whiskers” typically represent?
A. The minimum and maximum values within a defined multiple of the interquartile range, or the actual
extremes if no outliers are present
B. The mean ± one standard deviation
C. The 5th and 95th percentiles only
D. The mode of the data
WGU C784 Applied Healthcare Statistics Actual Exam 2026/2027 | Verified Questions
, Correct Answer: B
Rationale: Whiskers extend to the most extreme observations within a specified distance (commonly 1.5 × IQR) of the
quartiles.
5. What is the interquartile range (IQR)?
A. The difference between the third quartile (Q3) and the first quartile (Q1)
B. The difference between the maximum and minimum values
C. The average of the mean and median
D. The standard deviation multiplied by 1.5
Correct Answer: A
Rationale: IQR = Q3 − Q1 and measures the spread of the middle 50% of the data.
6. Which measure of variability is most sensitive to extreme outliers?
A. Interquartile range
B. Range
C. Median absolute deviation
D. Mode
Correct Answer: D
Rationale: The range uses the most extreme values and is therefore highly sensitive to outliers.
7. When is the mode the preferred measure of central tendency?
A. For nominal or categorical data where the most frequent category is of interest
B. For every continuous skewed distribution
C. Only when the mean and median are equal
D. Never in healthcare data
Correct Answer: A
Rationale: The mode identifies the most common category and is the only measure of central tendency defined for nominal
data.
8. What does a right-skewed (positively skewed) distribution look like?
A. A long tail extending to the right, with the mean typically greater than the median
B. A long tail extending to the left, with the mean less than the median
C. Perfect symmetry around the mean
D. A uniform rectangular shape
Correct Answer: B
Rationale: Positive skew is characterized by a longer right tail and a mean pulled toward the higher values.
9. Which of the following is an example of a continuous variable in healthcare data?
A. Blood pressure (mm Hg)
B. Blood type (A, B, AB, O)
C. Number of hospital admissions (count)
D. Gender (male/female)
Correct Answer: A
Rationale: Blood pressure can take any value within a range and is measured on a continuous scale.
10. What is the primary advantage of a stem-and-leaf plot compared with a histogram?
A. It preserves the actual data values while still showing the overall distribution
B. It requires no ordering of the data
C. It is useful only for categorical data
D. It cannot display outliers
Correct Answer: B
Rationale: Stem-and-leaf plots retain individual observations, allowing both distribution shape and exact values to be
examined.
11. In a frequency distribution, what does a relative frequency represent?
A. The proportion or percentage of observations falling into a particular category or interval
B. The absolute count of observations in a category
C. The cumulative total of all previous categories
D. The difference between consecutive frequencies
WGU C784 Applied Healthcare Statistics Actual Exam 2026/2027 | Verified Questions
