WGU C784 APPLIED HEALTHCARE STATISTICS
EXAM PREP (2025–2026 )200 PRACTICE
QUESTIONS, DETAILED ANSWERS & RATIONALES
FOR OBJECTIVE ASSESSMENT SUCCESS A+ ALREADY
GRADED LATEST VERSION
Question 1
A nurse records the following patient temperatures (°F):
98.2, 99.1, 98.7, 98.5, 99.0
What is the mean temperature?
A. 98.5
B. 98.7
C. 98.9
D. 99.1
Answer: B. 98.7
Rationale:
(98.2 + 99.1 + 98.7 + 98.5 + 99.0) ÷ 5 = 493.5 ÷ 5 = 98.7
Question 2
Which measure of central tendency is most affected by extreme values?
A. Mode
B. Median
C. Mean
D. Range
Answer: C. Mean
Rationale:
The mean uses every value in a dataset and is therefore heavily influenced by outliers.
Question 3
,A dataset contains the values:
3, 5, 7, 7, 8, 10
What is the median?
A. 6
B. 7
C. 7.5
D. 8
Answer: B. 7
Rationale:
The middle two values are 7 and 7. Their average is 7.
Question 4
Which type of variable is blood type?
A. Continuous
B. Discrete
C. Quantitative
D. Qualitative
Answer: D. Qualitative
Rationale:
Blood type represents categories rather than numerical measurements.
Question 5
The range of the values 12, 18, 20, 24, and 30 is:
A. 12
B. 18
C. 20
D. 30
Answer: B. 18
Rationale:
Range = Highest − Lowest = 30 − 12 = 18.
Question 6
What is the probability of rolling a 3 on a fair six-sided die?
,A. 1/2
B. 1/3
C. 1/6
D. 1/12
Answer: C. 1/6
Rationale:
There is one favorable outcome out of six possible outcomes.
Question 7
A researcher wants to determine whether a new medication lowers blood pressure more effectively
than the standard medication. Which statistical process is most appropriate?
A. Descriptive statistics
B. Hypothesis testing
C. Frequency distribution
D. Data classification
Answer: B. Hypothesis Testing
Rationale:
Hypothesis testing evaluates whether observed differences are statistically significant.
Question 8
Which graph is best for displaying categorical data?
A. Scatterplot
B. Histogram
C. Bar chart
D. Line graph
Answer: C. Bar Chart
Rationale:
Bar charts compare frequencies among categories.
Question 9
What does a p-value less than 0.05 generally indicate?
A. No relationship exists
B. The null hypothesis should be rejected
, C. The study is invalid
D. The sample size is too small
Answer: B. The null hypothesis should be rejected
Rationale:
A p-value below 0.05 suggests statistical significance.
Question 10
A correlation coefficient of +0.90 indicates:
A. Strong positive relationship
B. Strong negative relationship
C. No relationship
D. Weak relationship
Answer: A. Strong Positive Relationship
Rationale:
Values close to +1 indicate a strong positive correlation.
Question 11
Which measure describes the spread of data around the mean?
A. Median
B. Mode
C. Standard deviation
D. Frequency
Answer: C. Standard Deviation
Rationale:
Standard deviation measures variability.
Question 12
A sample is:
A. Every member of a population
B. A subset of a population
C. An outlier
D. A variable
Answer: B. A Subset of a Population
EXAM PREP (2025–2026 )200 PRACTICE
QUESTIONS, DETAILED ANSWERS & RATIONALES
FOR OBJECTIVE ASSESSMENT SUCCESS A+ ALREADY
GRADED LATEST VERSION
Question 1
A nurse records the following patient temperatures (°F):
98.2, 99.1, 98.7, 98.5, 99.0
What is the mean temperature?
A. 98.5
B. 98.7
C. 98.9
D. 99.1
Answer: B. 98.7
Rationale:
(98.2 + 99.1 + 98.7 + 98.5 + 99.0) ÷ 5 = 493.5 ÷ 5 = 98.7
Question 2
Which measure of central tendency is most affected by extreme values?
A. Mode
B. Median
C. Mean
D. Range
Answer: C. Mean
Rationale:
The mean uses every value in a dataset and is therefore heavily influenced by outliers.
Question 3
,A dataset contains the values:
3, 5, 7, 7, 8, 10
What is the median?
A. 6
B. 7
C. 7.5
D. 8
Answer: B. 7
Rationale:
The middle two values are 7 and 7. Their average is 7.
Question 4
Which type of variable is blood type?
A. Continuous
B. Discrete
C. Quantitative
D. Qualitative
Answer: D. Qualitative
Rationale:
Blood type represents categories rather than numerical measurements.
Question 5
The range of the values 12, 18, 20, 24, and 30 is:
A. 12
B. 18
C. 20
D. 30
Answer: B. 18
Rationale:
Range = Highest − Lowest = 30 − 12 = 18.
Question 6
What is the probability of rolling a 3 on a fair six-sided die?
,A. 1/2
B. 1/3
C. 1/6
D. 1/12
Answer: C. 1/6
Rationale:
There is one favorable outcome out of six possible outcomes.
Question 7
A researcher wants to determine whether a new medication lowers blood pressure more effectively
than the standard medication. Which statistical process is most appropriate?
A. Descriptive statistics
B. Hypothesis testing
C. Frequency distribution
D. Data classification
Answer: B. Hypothesis Testing
Rationale:
Hypothesis testing evaluates whether observed differences are statistically significant.
Question 8
Which graph is best for displaying categorical data?
A. Scatterplot
B. Histogram
C. Bar chart
D. Line graph
Answer: C. Bar Chart
Rationale:
Bar charts compare frequencies among categories.
Question 9
What does a p-value less than 0.05 generally indicate?
A. No relationship exists
B. The null hypothesis should be rejected
, C. The study is invalid
D. The sample size is too small
Answer: B. The null hypothesis should be rejected
Rationale:
A p-value below 0.05 suggests statistical significance.
Question 10
A correlation coefficient of +0.90 indicates:
A. Strong positive relationship
B. Strong negative relationship
C. No relationship
D. Weak relationship
Answer: A. Strong Positive Relationship
Rationale:
Values close to +1 indicate a strong positive correlation.
Question 11
Which measure describes the spread of data around the mean?
A. Median
B. Mode
C. Standard deviation
D. Frequency
Answer: C. Standard Deviation
Rationale:
Standard deviation measures variability.
Question 12
A sample is:
A. Every member of a population
B. A subset of a population
C. An outlier
D. A variable
Answer: B. A Subset of a Population
