WGU C784 Applied
Healthcare Statistics Final
Question 1
A nurse calculates the average length of stay for patients in a medical unit. Which measure is being
calculated?
A. Median
B. Mode
C. Mean
D. Range
Answer: C. Mean
Rationale: The mean is the arithmetic average obtained by summing all observations and dividing by
the number of observations.
,Question 2
Which measure of variability is expressed in the same units as the original data?
A. Variance
B. Standard Deviation
C. Probability
D. Correlation Coefficient
Answer: B. Standard Deviation
Rationale: Standard deviation is the square root of variance and is reported in the same units as the
original variable.
Question 3
A hospital administrator wants to identify the most frequently occurring blood type among patients.
Which measure should be used?
A. Mean
B. Median
C. Mode
D. Range
Answer: C. Mode
Rationale: The mode identifies the value that occurs most often in a dataset.
Question 4
Which level of measurement is represented by patient marital status?
A. Ratio
B. Interval
C. Nominal
D. Continuous
Answer: C. Nominal
Rationale: Marital status consists of categories with no inherent ranking.
Question 5
The range is calculated as:
A. Mean ÷ Median
B. Highest Value − Lowest Value
,C. Sum of Scores ÷ Number of Scores
D. Standard Deviation²
Answer: B. Highest Value − Lowest Value
Rationale: The range measures spread by subtracting the minimum value from the maximum value.
Question 6
A sample is best defined as:
A. The entire group being studied
B. A subset of the population
C. The study outcome
D. A measurement scale
Answer: B. A subset of the population
Rationale: Samples are selected from populations to draw conclusions about the larger group.
Question 7
Which graph is most appropriate for displaying categorical data?
A. Scatterplot
B. Histogram
C. Pie Chart
D. Line Graph
Answer: C. Pie Chart
Rationale: Pie charts display proportions of categories within a whole.
Question 8
A probability of 0 indicates:
A. Certainty
B. Equal likelihood
C. Impossible event
D. Likely event
Answer: C. Impossible event
Rationale: A probability of zero means the event cannot occur.
, Question 9
A probability of 1 indicates:
A. Impossible event
B. Certain event
C. Random event
D. Rare event
Answer: B. Certain event
Rationale: A probability of one means the event will definitely occur.
Question 10
What is the mean of 4, 6, 8, 12, and 20?
A. 8
B. 10
C. 12
D. 14
Answer: B. 10
Rationale: (4 + 6 + 8 + 12 + 20) ÷ 5 = 50 ÷ 5 = 10.
Question 11
The median of 2, 4, 7, 9, and 15 is:
A. 4
B. 7
C. 8
D. 9
Answer: B. 7
Rationale: The median is the middle value when data are arranged in order.
Question 12
A right-skewed distribution typically has:
A. Mean less than median
B. Mean equal to median
C. Mean greater than median
D. No mean
Healthcare Statistics Final
Question 1
A nurse calculates the average length of stay for patients in a medical unit. Which measure is being
calculated?
A. Median
B. Mode
C. Mean
D. Range
Answer: C. Mean
Rationale: The mean is the arithmetic average obtained by summing all observations and dividing by
the number of observations.
,Question 2
Which measure of variability is expressed in the same units as the original data?
A. Variance
B. Standard Deviation
C. Probability
D. Correlation Coefficient
Answer: B. Standard Deviation
Rationale: Standard deviation is the square root of variance and is reported in the same units as the
original variable.
Question 3
A hospital administrator wants to identify the most frequently occurring blood type among patients.
Which measure should be used?
A. Mean
B. Median
C. Mode
D. Range
Answer: C. Mode
Rationale: The mode identifies the value that occurs most often in a dataset.
Question 4
Which level of measurement is represented by patient marital status?
A. Ratio
B. Interval
C. Nominal
D. Continuous
Answer: C. Nominal
Rationale: Marital status consists of categories with no inherent ranking.
Question 5
The range is calculated as:
A. Mean ÷ Median
B. Highest Value − Lowest Value
,C. Sum of Scores ÷ Number of Scores
D. Standard Deviation²
Answer: B. Highest Value − Lowest Value
Rationale: The range measures spread by subtracting the minimum value from the maximum value.
Question 6
A sample is best defined as:
A. The entire group being studied
B. A subset of the population
C. The study outcome
D. A measurement scale
Answer: B. A subset of the population
Rationale: Samples are selected from populations to draw conclusions about the larger group.
Question 7
Which graph is most appropriate for displaying categorical data?
A. Scatterplot
B. Histogram
C. Pie Chart
D. Line Graph
Answer: C. Pie Chart
Rationale: Pie charts display proportions of categories within a whole.
Question 8
A probability of 0 indicates:
A. Certainty
B. Equal likelihood
C. Impossible event
D. Likely event
Answer: C. Impossible event
Rationale: A probability of zero means the event cannot occur.
, Question 9
A probability of 1 indicates:
A. Impossible event
B. Certain event
C. Random event
D. Rare event
Answer: B. Certain event
Rationale: A probability of one means the event will definitely occur.
Question 10
What is the mean of 4, 6, 8, 12, and 20?
A. 8
B. 10
C. 12
D. 14
Answer: B. 10
Rationale: (4 + 6 + 8 + 12 + 20) ÷ 5 = 50 ÷ 5 = 10.
Question 11
The median of 2, 4, 7, 9, and 15 is:
A. 4
B. 7
C. 8
D. 9
Answer: B. 7
Rationale: The median is the middle value when data are arranged in order.
Question 12
A right-skewed distribution typically has:
A. Mean less than median
B. Mean equal to median
C. Mean greater than median
D. No mean
