WGU C784 Applied Healthcare Statistics Objective
Assessment Exam Prep 2026 | 60+ Practice Questions with
Detailed Rationales
Question 1
A healthcare researcher calculates the average systolic blood pressure of 150
participants in a community health study. Which measure of central tendency is
being reported?
A. Range
B. Mean
C. Variance
D. Standard deviation
Correct Answer:
B. Mean
Rationale:
The mean is calculated by adding all observations and dividing by the total number
of observations. It represents the arithmetic average and is the most commonly
used measure of central tendency when data are approximately normally
distributed.
,Question 2
A quality improvement team records patients' blood types (A, B, AB, and O) for a
hospital report. Which type of data is being collected?
A. Continuous data
B. Ordinal data
C. Nominal data
D. Ratio data
Correct Answer:
C. Nominal data
Rationale:
Nominal data consist of categories without any natural order or ranking. Blood
types are labels rather than numerical values and cannot be arranged in a
meaningful sequence.
Question 3
Which measure describes the spread of values around the mean in a dataset?
A. Median
B. Mode
C. Standard deviation
D. Percentile
Correct Answer:
C. Standard deviation
,Rationale:
Standard deviation measures how much individual observations vary from the
mean. A small standard deviation indicates values are clustered near the mean,
whereas a large standard deviation indicates greater variability.
Question 4
A clinical trial reports a p-value of 0.02 after comparing two treatments. Using a
significance level of 0.05, what is the appropriate conclusion?
A. Fail to reject the null hypothesis.
B. Reject the null hypothesis because the result is statistically significant.
C. The treatments are identical.
D. The study contains a Type II error.
Correct Answer:
B. Reject the null hypothesis because the result is statistically significant.
Rationale:
When the p-value is less than the chosen significance level (α = 0.05), the results
are considered statistically significant. This provides sufficient evidence to reject
the null hypothesis, although it does not prove causation.
Question 5
Which sampling method gives every member of a population an equal chance of
being selected?
, A. Convenience sampling
B. Purposive sampling
C. Simple random sampling
D. Snowball sampling
Correct Answer:
C. Simple random sampling
Rationale:
Simple random sampling minimizes selection bias by ensuring every individual in
the population has an equal probability of inclusion. This improves the
representativeness of the sample.
Question 6
A dataset contains the following values:
12, 14, 16, 18, 20
What is the median?
A. 14
B. 15
C. 16
D. 18
Correct Answer:
C. 16
Assessment Exam Prep 2026 | 60+ Practice Questions with
Detailed Rationales
Question 1
A healthcare researcher calculates the average systolic blood pressure of 150
participants in a community health study. Which measure of central tendency is
being reported?
A. Range
B. Mean
C. Variance
D. Standard deviation
Correct Answer:
B. Mean
Rationale:
The mean is calculated by adding all observations and dividing by the total number
of observations. It represents the arithmetic average and is the most commonly
used measure of central tendency when data are approximately normally
distributed.
,Question 2
A quality improvement team records patients' blood types (A, B, AB, and O) for a
hospital report. Which type of data is being collected?
A. Continuous data
B. Ordinal data
C. Nominal data
D. Ratio data
Correct Answer:
C. Nominal data
Rationale:
Nominal data consist of categories without any natural order or ranking. Blood
types are labels rather than numerical values and cannot be arranged in a
meaningful sequence.
Question 3
Which measure describes the spread of values around the mean in a dataset?
A. Median
B. Mode
C. Standard deviation
D. Percentile
Correct Answer:
C. Standard deviation
,Rationale:
Standard deviation measures how much individual observations vary from the
mean. A small standard deviation indicates values are clustered near the mean,
whereas a large standard deviation indicates greater variability.
Question 4
A clinical trial reports a p-value of 0.02 after comparing two treatments. Using a
significance level of 0.05, what is the appropriate conclusion?
A. Fail to reject the null hypothesis.
B. Reject the null hypothesis because the result is statistically significant.
C. The treatments are identical.
D. The study contains a Type II error.
Correct Answer:
B. Reject the null hypothesis because the result is statistically significant.
Rationale:
When the p-value is less than the chosen significance level (α = 0.05), the results
are considered statistically significant. This provides sufficient evidence to reject
the null hypothesis, although it does not prove causation.
Question 5
Which sampling method gives every member of a population an equal chance of
being selected?
, A. Convenience sampling
B. Purposive sampling
C. Simple random sampling
D. Snowball sampling
Correct Answer:
C. Simple random sampling
Rationale:
Simple random sampling minimizes selection bias by ensuring every individual in
the population has an equal probability of inclusion. This improves the
representativeness of the sample.
Question 6
A dataset contains the following values:
12, 14, 16, 18, 20
What is the median?
A. 14
B. 15
C. 16
D. 18
Correct Answer:
C. 16
