WGU C784 – APPLIED HEALTHCARE
STATISTICS OBJECTIVE ASSESSMENT EXAM
ACTUAL EXAM QUESTIONS AND 100% VERIFIED
ANSWERS WITH RATIONALES GRADED A+ LATEST
Question 1
A nurse researcher summarizes systolic blood pressure values from a clinic
population. The distribution is heavily right-skewed due to several extremely high
readings. Which measure of central tendency best represents the “typical” blood
pressure?
A. Mean
B. Median
C. Mode
D. Range
Correct Answer: B. Median
Rationale:
In skewed distributions, the median is resistant to extreme values and best
represents the typical observation. The mean would be pulled upward by outliers.
Question 2
Which Excel function would a healthcare analyst use to calculate the standard
deviation of a sample of patient cholesterol values?
A. =VAR.P()
B. =STDEV.S()
C. =AVERAGE()
D. =MEDIAN()
Correct Answer: B. =STDEV.S()
,Rationale:
=STDEV.S() calculates the sample standard deviation, which is appropriate
when data represent a sample rather than an entire population.
Question 3
A dataset shows the following values:
120, 122, 125, 130, 250
Which statement is most accurate?
A. The mean equals the median
B. The range is small
C. There is a likely outlier
D. The distribution is symmetric
Correct Answer: C. There is a likely outlier
Rationale:
The value 250 is substantially higher than the rest, suggesting an outlier that can
distort the mean and spread.
Question 4
Which statistic best measures variability in patient length-of-stay data?
A. Mean
B. Median
C. Standard deviation
D. Mode
Correct Answer: C. Standard deviation
Rationale:
Standard deviation quantifies how much individual values vary from the mean,
making it ideal for understanding variability.
,Question 5
A boxplot displays a long upper whisker and several points beyond it. What does
this indicate?
A. Symmetric distribution
B. Left skew
C. Right skew with outliers
D. Normal distribution
Correct Answer: C. Right skew with outliers
Rationale:
A long upper tail and extreme points indicate a right-skewed distribution with
outliers.
Question 6
Which graph is most appropriate for comparing infection rates across multiple
hospital units?
A. Histogram
B. Boxplot
C. Bar chart
D. Scatterplot
Correct Answer: C. Bar chart
Rationale:
Bar charts are ideal for comparing categorical groups, such as hospital units.
Question 7
A scatterplot shows a downward trend between exercise frequency and HbA1c
levels. This indicates:
A. No relationship
B. Positive correlation
, C. Negative correlation
D. Causation
Correct Answer: C. Negative correlation
Rationale:
As one variable increases while the other decreases, a negative correlation is
present. Correlation does not imply causation.
Question 8
Which chart best displays changes in emergency department volume over time?
A. Pie chart
B. Line graph
C. Boxplot
D. Histogram
Correct Answer: B. Line graph
Rationale:
Line graphs effectively show trends over time, which is essential for volume
analysis.
Question 9
A pie chart is most appropriate when:
A. Comparing numerical distributions
B. Showing trends
C. Displaying proportions of a whole
D. Identifying outliers
Correct Answer: C. Displaying proportions of a whole
Rationale:
Pie charts represent parts of a whole, such as percentage breakdowns.
STATISTICS OBJECTIVE ASSESSMENT EXAM
ACTUAL EXAM QUESTIONS AND 100% VERIFIED
ANSWERS WITH RATIONALES GRADED A+ LATEST
Question 1
A nurse researcher summarizes systolic blood pressure values from a clinic
population. The distribution is heavily right-skewed due to several extremely high
readings. Which measure of central tendency best represents the “typical” blood
pressure?
A. Mean
B. Median
C. Mode
D. Range
Correct Answer: B. Median
Rationale:
In skewed distributions, the median is resistant to extreme values and best
represents the typical observation. The mean would be pulled upward by outliers.
Question 2
Which Excel function would a healthcare analyst use to calculate the standard
deviation of a sample of patient cholesterol values?
A. =VAR.P()
B. =STDEV.S()
C. =AVERAGE()
D. =MEDIAN()
Correct Answer: B. =STDEV.S()
,Rationale:
=STDEV.S() calculates the sample standard deviation, which is appropriate
when data represent a sample rather than an entire population.
Question 3
A dataset shows the following values:
120, 122, 125, 130, 250
Which statement is most accurate?
A. The mean equals the median
B. The range is small
C. There is a likely outlier
D. The distribution is symmetric
Correct Answer: C. There is a likely outlier
Rationale:
The value 250 is substantially higher than the rest, suggesting an outlier that can
distort the mean and spread.
Question 4
Which statistic best measures variability in patient length-of-stay data?
A. Mean
B. Median
C. Standard deviation
D. Mode
Correct Answer: C. Standard deviation
Rationale:
Standard deviation quantifies how much individual values vary from the mean,
making it ideal for understanding variability.
,Question 5
A boxplot displays a long upper whisker and several points beyond it. What does
this indicate?
A. Symmetric distribution
B. Left skew
C. Right skew with outliers
D. Normal distribution
Correct Answer: C. Right skew with outliers
Rationale:
A long upper tail and extreme points indicate a right-skewed distribution with
outliers.
Question 6
Which graph is most appropriate for comparing infection rates across multiple
hospital units?
A. Histogram
B. Boxplot
C. Bar chart
D. Scatterplot
Correct Answer: C. Bar chart
Rationale:
Bar charts are ideal for comparing categorical groups, such as hospital units.
Question 7
A scatterplot shows a downward trend between exercise frequency and HbA1c
levels. This indicates:
A. No relationship
B. Positive correlation
, C. Negative correlation
D. Causation
Correct Answer: C. Negative correlation
Rationale:
As one variable increases while the other decreases, a negative correlation is
present. Correlation does not imply causation.
Question 8
Which chart best displays changes in emergency department volume over time?
A. Pie chart
B. Line graph
C. Boxplot
D. Histogram
Correct Answer: B. Line graph
Rationale:
Line graphs effectively show trends over time, which is essential for volume
analysis.
Question 9
A pie chart is most appropriate when:
A. Comparing numerical distributions
B. Showing trends
C. Displaying proportions of a whole
D. Identifying outliers
Correct Answer: C. Displaying proportions of a whole
Rationale:
Pie charts represent parts of a whole, such as percentage breakdowns.
