C784 Applied Healthcare Statistics OA Comprehensive Review
2026/2027 WGU
1. A researcher is categorizing hospital departments by their specialty, such as
‘Cardiology’, ‘Neurology’, and ‘Pediatrics’. What type of data is this?
A. Ordinal data
B. Discrete numerical data
C. Nominal data
D. Continuous numerical data
Answer: C
Rationale: Nominal data represents categories without any intrinsic ordering or ranking.
2. A study measures the weight of newborn babies in grams. What level of
measurement is this?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Answer: D
Rationale: Weight is ratio data because it has a true zero point, and ratios are meaningful
(e.g., 4000g is twice as heavy as 2000g).
,3. A patient’s satisfaction score is recorded on a scale of 1 to 5, where 1 is ‘Very
Dissatisfied’ and 5 is ‘Very Satisfied’. This is an example of which data type?
A. Ordinal
B. Nominal
C. Continuous
D. Ratio
Answer: A
Rationale: Ordinal data has a logical order or ranking, but the distance between points is
not necessarily equal.
4. In a dataset containing the values {10, 12, 12, 15, 20}, what is the median?
A. 10
B. 13.8
C. 12
D. 15
Answer: C
Rationale: The median is the middle value when the data is ordered; in this five-value set,
the third value is 12.
5. Which measure of central tendency is most affected by extreme outliers?
A. Mean
B. Mode
C. Median
D. Interquartile Range
Answer: A
Rationale: The mean is calculated using every value in the dataset, making it sensitive to
extreme values (outliers).
, 6. In a dataset of blood pressure readings, the mean is 120 and the standard
deviation is 10. What percentage of values fall between 110 and 130 in a normal
distribution?
A. 50%
B. 68%
C. 95%
D. 99.7%
Answer: B
Rationale: The Empirical Rule states that approximately 68% of data falls within one
standard deviation of the mean in a normal distribution.
7. What is the relationship between the mean and median in a right-skewed
distribution?
A. The mean is less than the median.
B. The mean is greater than the median.
C. The mean and median are equal.
D. The median is equal to the mode.
Answer: B
Rationale: In a right-skewed (positively skewed) distribution, the tail is on the right, which
pulls the mean to the right of the median.
8. Which of the following values represents the strongest correlation
coefficient?
A. 0.85
B. 0.05
C. -0.92
D. -0.50
Answer: C
2026/2027 WGU
1. A researcher is categorizing hospital departments by their specialty, such as
‘Cardiology’, ‘Neurology’, and ‘Pediatrics’. What type of data is this?
A. Ordinal data
B. Discrete numerical data
C. Nominal data
D. Continuous numerical data
Answer: C
Rationale: Nominal data represents categories without any intrinsic ordering or ranking.
2. A study measures the weight of newborn babies in grams. What level of
measurement is this?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Answer: D
Rationale: Weight is ratio data because it has a true zero point, and ratios are meaningful
(e.g., 4000g is twice as heavy as 2000g).
,3. A patient’s satisfaction score is recorded on a scale of 1 to 5, where 1 is ‘Very
Dissatisfied’ and 5 is ‘Very Satisfied’. This is an example of which data type?
A. Ordinal
B. Nominal
C. Continuous
D. Ratio
Answer: A
Rationale: Ordinal data has a logical order or ranking, but the distance between points is
not necessarily equal.
4. In a dataset containing the values {10, 12, 12, 15, 20}, what is the median?
A. 10
B. 13.8
C. 12
D. 15
Answer: C
Rationale: The median is the middle value when the data is ordered; in this five-value set,
the third value is 12.
5. Which measure of central tendency is most affected by extreme outliers?
A. Mean
B. Mode
C. Median
D. Interquartile Range
Answer: A
Rationale: The mean is calculated using every value in the dataset, making it sensitive to
extreme values (outliers).
, 6. In a dataset of blood pressure readings, the mean is 120 and the standard
deviation is 10. What percentage of values fall between 110 and 130 in a normal
distribution?
A. 50%
B. 68%
C. 95%
D. 99.7%
Answer: B
Rationale: The Empirical Rule states that approximately 68% of data falls within one
standard deviation of the mean in a normal distribution.
7. What is the relationship between the mean and median in a right-skewed
distribution?
A. The mean is less than the median.
B. The mean is greater than the median.
C. The mean and median are equal.
D. The median is equal to the mode.
Answer: B
Rationale: In a right-skewed (positively skewed) distribution, the tail is on the right, which
pulls the mean to the right of the median.
8. Which of the following values represents the strongest correlation
coefficient?
A. 0.85
B. 0.05
C. -0.92
D. -0.50
Answer: C
