WGU C784 APPLIED HEALTHCARE STATISTICS OA
EXAM QUESTIONS AND 100% VERIFIED
ANSWERS WITH RATIONALES GRADED A+ LATEST
1. A clinic records the number of appointments completed by five patients
during a month: 2, 4, 3, 6, and 5. What is the mean number of completed
appointments?
A. 3
B. 4
C. 4.5
D. 5
Answer: B
Rationale: The mean is calculated by adding all observations and dividing by the
number of observations: (2 + 4 + 3 + 6 + 5) / 5 = = 4.
2. A nurse reviews the following systolic blood pressure measurements from
seven patients:
118, 122, 125, 125, 127, 131, 160 mm Hg
Which measure of central tendency is least affected by the unusually high
value of 160 mm Hg?
A. Mean
B. Median
,C. Mode
D. Weighted mean
Answer: B
Rationale: The median is the middle observation when the data are ordered.
Because it depends on position rather than the magnitude of every value, it is
relatively resistant to an extreme outlier such as 160 mm Hg.
3. A hospital quality-improvement team records the following numbers of
medication errors over six months:
3, 7, 5, 9, 4, 6
What is the range?
A. 4
B. 5
C. 6
D. 7
Answer: C
Rationale: The range is the maximum value minus the minimum value. Here, 9 −
3 = 6. Therefore, the correct answer is C.
4. A dataset contains the values:
12, 15, 18, 21, 24
What is the median?
A. 15
,B. 18
C. 19
D. 21
Answer: B
Rationale: There are five ordered observations, so the median is the third value.
The third value is 18.
5. A patient-satisfaction survey produces the following scores:
7, 8, 8, 9, 10, 8, 6
Which value represents the mode?
A. 6
B. 7
C. 8
D. 9
Answer: C
Rationale: The mode is the value occurring most frequently. The score 8 occurs
three times, more frequently than any other value.
6. A laboratory manager wants to display the distribution of hemoglobin
values for 500 adult patients. Which graph is most appropriate?
A. Pie chart
B. Histogram
C. Bar chart
, D. Two-way table
Answer: B
Rationale: A histogram is appropriate for displaying the distribution of
quantitative data such as hemoglobin concentration. It groups numerical
observations into intervals and shows their frequencies.
7. A hospital categorizes patients according to discharge disposition: home,
rehabilitation facility, skilled nursing facility, or hospice. Which display would
be most appropriate for comparing the number of patients in each category?
A. Histogram
B. Scatterplot
C. Bar chart
D. Box plot
Answer: C
Rationale: Discharge disposition is categorical data. A bar chart is designed to
compare frequencies or counts across categorical groups.
8. The average length of stay on a medical unit is 6 days with a standard
deviation of 1 day. Assuming the data are approximately normally
distributed, approximately what percentage of observations should fall
between 5 and 7 days?
A. 34%
B. 68%
EXAM QUESTIONS AND 100% VERIFIED
ANSWERS WITH RATIONALES GRADED A+ LATEST
1. A clinic records the number of appointments completed by five patients
during a month: 2, 4, 3, 6, and 5. What is the mean number of completed
appointments?
A. 3
B. 4
C. 4.5
D. 5
Answer: B
Rationale: The mean is calculated by adding all observations and dividing by the
number of observations: (2 + 4 + 3 + 6 + 5) / 5 = = 4.
2. A nurse reviews the following systolic blood pressure measurements from
seven patients:
118, 122, 125, 125, 127, 131, 160 mm Hg
Which measure of central tendency is least affected by the unusually high
value of 160 mm Hg?
A. Mean
B. Median
,C. Mode
D. Weighted mean
Answer: B
Rationale: The median is the middle observation when the data are ordered.
Because it depends on position rather than the magnitude of every value, it is
relatively resistant to an extreme outlier such as 160 mm Hg.
3. A hospital quality-improvement team records the following numbers of
medication errors over six months:
3, 7, 5, 9, 4, 6
What is the range?
A. 4
B. 5
C. 6
D. 7
Answer: C
Rationale: The range is the maximum value minus the minimum value. Here, 9 −
3 = 6. Therefore, the correct answer is C.
4. A dataset contains the values:
12, 15, 18, 21, 24
What is the median?
A. 15
,B. 18
C. 19
D. 21
Answer: B
Rationale: There are five ordered observations, so the median is the third value.
The third value is 18.
5. A patient-satisfaction survey produces the following scores:
7, 8, 8, 9, 10, 8, 6
Which value represents the mode?
A. 6
B. 7
C. 8
D. 9
Answer: C
Rationale: The mode is the value occurring most frequently. The score 8 occurs
three times, more frequently than any other value.
6. A laboratory manager wants to display the distribution of hemoglobin
values for 500 adult patients. Which graph is most appropriate?
A. Pie chart
B. Histogram
C. Bar chart
, D. Two-way table
Answer: B
Rationale: A histogram is appropriate for displaying the distribution of
quantitative data such as hemoglobin concentration. It groups numerical
observations into intervals and shows their frequencies.
7. A hospital categorizes patients according to discharge disposition: home,
rehabilitation facility, skilled nursing facility, or hospice. Which display would
be most appropriate for comparing the number of patients in each category?
A. Histogram
B. Scatterplot
C. Bar chart
D. Box plot
Answer: C
Rationale: Discharge disposition is categorical data. A bar chart is designed to
compare frequencies or counts across categorical groups.
8. The average length of stay on a medical unit is 6 days with a standard
deviation of 1 day. Assuming the data are approximately normally
distributed, approximately what percentage of observations should fall
between 5 and 7 days?
A. 34%
B. 68%
