WGU C784 APPLIED HEALTHCARE
STATISTICS Examination Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026/2027 Q&A Grade A+
1. Which level of measurement classifies blood type (A, B, AB, O)?
a. Interval
b. Ordinal
c. Nominal
d. Ratio
Rationale: Nominal data are categories with no inherent order, such
as blood types.
2. The mean is best described as the:
a. Middle value
b. Arithmetic average
c. Most frequent value
d. Range of values
Rationale: The mean is calculated by summing all values and
dividing by the number of observations.
3. Which measure of central tendency is most affected by outliers?
a. Mean
b. Median
c. Mode
d. Interquartile range
,Rationale: Extreme values disproportionately influence the mean
compared to other measures.
4. A hospital records patient satisfaction on a scale of poor, fair,
good, excellent. This data is:
a. Nominal
b. Ordinal
c. Interval
d. Ratio
Rationale: Ordinal data have ranked categories without equal
intervals between them.
5. What does a p-value represent?
a. Probability the null hypothesis is true
b. Probability of observing results assuming the null hypothesis is
true
c. Probability the alternative hypothesis is false
d. Strength of correlation
Rationale: The p-value measures how likely observed data would
occur under the null hypothesis.
6. Which graph is best for displaying categorical data?
a. Bar chart
b. Histogram
c. Box plot
d. Scatterplot
Rationale: Bar charts compare frequencies across categories.
, 7. A Type I error occurs when:
a. The null hypothesis is rejected when it is true
b. The null hypothesis is accepted when it is false
c. The sample size is too large
d. The p-value is high
Rationale: A Type I error is a false positive.
8. What is the primary purpose of inferential statistics?
a. Summarize data
b. Make conclusions about a population based on a sample
c. Organize healthcare data
d. Display raw data
Rationale: Inferential statistics allow population-level conclusions
from sample data.
9. Which measure describes data spread?
a. Mean
b. Median
c. Standard deviation
d. Mode
Rationale: Standard deviation quantifies variability around the
mean.
10. The null hypothesis typically states that:
a. There is a relationship
b. There is no effect or difference
STATISTICS Examination Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026/2027 Q&A Grade A+
1. Which level of measurement classifies blood type (A, B, AB, O)?
a. Interval
b. Ordinal
c. Nominal
d. Ratio
Rationale: Nominal data are categories with no inherent order, such
as blood types.
2. The mean is best described as the:
a. Middle value
b. Arithmetic average
c. Most frequent value
d. Range of values
Rationale: The mean is calculated by summing all values and
dividing by the number of observations.
3. Which measure of central tendency is most affected by outliers?
a. Mean
b. Median
c. Mode
d. Interquartile range
,Rationale: Extreme values disproportionately influence the mean
compared to other measures.
4. A hospital records patient satisfaction on a scale of poor, fair,
good, excellent. This data is:
a. Nominal
b. Ordinal
c. Interval
d. Ratio
Rationale: Ordinal data have ranked categories without equal
intervals between them.
5. What does a p-value represent?
a. Probability the null hypothesis is true
b. Probability of observing results assuming the null hypothesis is
true
c. Probability the alternative hypothesis is false
d. Strength of correlation
Rationale: The p-value measures how likely observed data would
occur under the null hypothesis.
6. Which graph is best for displaying categorical data?
a. Bar chart
b. Histogram
c. Box plot
d. Scatterplot
Rationale: Bar charts compare frequencies across categories.
, 7. A Type I error occurs when:
a. The null hypothesis is rejected when it is true
b. The null hypothesis is accepted when it is false
c. The sample size is too large
d. The p-value is high
Rationale: A Type I error is a false positive.
8. What is the primary purpose of inferential statistics?
a. Summarize data
b. Make conclusions about a population based on a sample
c. Organize healthcare data
d. Display raw data
Rationale: Inferential statistics allow population-level conclusions
from sample data.
9. Which measure describes data spread?
a. Mean
b. Median
c. Standard deviation
d. Mode
Rationale: Standard deviation quantifies variability around the
mean.
10. The null hypothesis typically states that:
a. There is a relationship
b. There is no effect or difference
