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WGU C784 APPLIED HEALTHCARE STATISTICS EXAM
2025-2026 | 100 PRACTICE QUESTIONS WITH DETAILED
ANSWERS,ALREADY GRADED A+
1
A hospital records the ages of a sample of 25 patients. The mean age is 58
and the standard deviation is 8. Which measure describes the central
tendency and spread?
A. Median and range
B. Mean and standard deviation
C. Mode and interquartile range
D. Geometric mean and variance
Correct answer: B
Rationale: Mean describes central tendency and standard deviation
describes spread for approximately symmetric or interval-level data.
2
Which level of measurement is a patient’s blood type (A, B, AB, O)?
A. Nominal
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B. Ordinal
C. Interval
D. Ratio
Correct answer: A
Rationale: Blood type categories are names without order — nominal scale.
3
A researcher wants to know whether a new drug reduces systolic blood
pressure. Which hypothesis is appropriate?
A. H0: μ_new = μ_old; H1: μ_new ≠ μ_old
B. H0: μ_new = μ_old; H1: μ_new < μ_old
C. H0: μ_new ≥ μ_old; H1: μ_new < μ_old
D. H0: μ_new ≠ μ_old; H1: μ_new = μ_old
Correct answer: C
Rationale: For testing reduction, null is that new drug is not less (≥),
alternative is that it is less (<).
4
Which distribution is used to model the number of emergency department
arrivals per hour?
A. Normal distribution
B. Poisson distribution
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C. Exponential distribution
D. Uniform distribution
Correct answer: B
Rationale: Counts of independent events in fixed intervals are often
modeled with Poisson.
5
If a variable is heavily right-skewed, which measure is least affected by
extreme values?
A. Mean
B. Range
C. Median
D. Variance
Correct answer: C
Rationale: Median is robust to outliers, unlike mean or variance.
6
A 95% confidence interval for a population mean does NOT contain 0.05.
What does this imply about a two-sided hypothesis test at α=0.05?
A. Fail to reject H0
B. Reject H0
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C. Insufficient information
D. Type II error
Correct answer: B
Rationale: If 0 (or the null value) is outside the 95% CI, the two-sided test
at α=0.05 would reject H0.
7
Which test compares means of two independent groups when data are
approximately normal with equal variances?
A. Paired t-test
B. Independent (two-sample) t-test
C. Wilcoxon signed-rank test
D. Chi-square test
Correct answer: B
Rationale: Two-sample t-test compares independent group means under
normality and equal variance assumptions.
8
Which nonparametric test compares two independent groups on an ordinal
outcome?
A. Mann–Whitney U test
B. Paired t-test
WGU C784 APPLIED HEALTHCARE STATISTICS EXAM
2025-2026 | 100 PRACTICE QUESTIONS WITH DETAILED
ANSWERS,ALREADY GRADED A+
1
A hospital records the ages of a sample of 25 patients. The mean age is 58
and the standard deviation is 8. Which measure describes the central
tendency and spread?
A. Median and range
B. Mean and standard deviation
C. Mode and interquartile range
D. Geometric mean and variance
Correct answer: B
Rationale: Mean describes central tendency and standard deviation
describes spread for approximately symmetric or interval-level data.
2
Which level of measurement is a patient’s blood type (A, B, AB, O)?
A. Nominal
,2|Page
B. Ordinal
C. Interval
D. Ratio
Correct answer: A
Rationale: Blood type categories are names without order — nominal scale.
3
A researcher wants to know whether a new drug reduces systolic blood
pressure. Which hypothesis is appropriate?
A. H0: μ_new = μ_old; H1: μ_new ≠ μ_old
B. H0: μ_new = μ_old; H1: μ_new < μ_old
C. H0: μ_new ≥ μ_old; H1: μ_new < μ_old
D. H0: μ_new ≠ μ_old; H1: μ_new = μ_old
Correct answer: C
Rationale: For testing reduction, null is that new drug is not less (≥),
alternative is that it is less (<).
4
Which distribution is used to model the number of emergency department
arrivals per hour?
A. Normal distribution
B. Poisson distribution
,3|Page
C. Exponential distribution
D. Uniform distribution
Correct answer: B
Rationale: Counts of independent events in fixed intervals are often
modeled with Poisson.
5
If a variable is heavily right-skewed, which measure is least affected by
extreme values?
A. Mean
B. Range
C. Median
D. Variance
Correct answer: C
Rationale: Median is robust to outliers, unlike mean or variance.
6
A 95% confidence interval for a population mean does NOT contain 0.05.
What does this imply about a two-sided hypothesis test at α=0.05?
A. Fail to reject H0
B. Reject H0
, 4|Page
C. Insufficient information
D. Type II error
Correct answer: B
Rationale: If 0 (or the null value) is outside the 95% CI, the two-sided test
at α=0.05 would reject H0.
7
Which test compares means of two independent groups when data are
approximately normal with equal variances?
A. Paired t-test
B. Independent (two-sample) t-test
C. Wilcoxon signed-rank test
D. Chi-square test
Correct answer: B
Rationale: Two-sample t-test compares independent group means under
normality and equal variance assumptions.
8
Which nonparametric test compares two independent groups on an ordinal
outcome?
A. Mann–Whitney U test
B. Paired t-test
