WGU C784 APPLIED HEALTHCARE
STATISTICS – PRACTICE 200+
QUESTIONS & ANSWERS A+ VERIFIED
LATEST VERSION 2026-2027 (ORIGINAL
STUDY MATERIAL)
1. Which measure of central tendency is most affected by extreme values?
A. Mode
B. Median
C. Mean
D. Range
Correct Answer: C. Mean
Explanation: The mean uses every value in the dataset, making it sensitive to outliers.
2. A dataset contains the values: 10, 12, 15, 15, 18. What is the median?
A. 12
B. 15
C. 14
D. 18
Correct Answer: B. 15
Explanation: The median is the middle value when data are arranged in order.
3. What does a standard deviation measure?
A. The average value
B. The most frequent value
C. The spread of data around the mean
D. The sample size
Correct Answer: C. The spread of data around the mean
,4. Which graph is best for displaying categorical data?
A. Histogram
B. Scatterplot
C. Bar chart
D. Line graph
Correct Answer: C. Bar chart
5. A probability of 0 indicates:
A. Certainty
B. An impossible event
C. A likely event
D. A random event
Correct Answer: B. An impossible event
6. What is the probability of obtaining heads on a fair coin toss?
A. 0.25
B. 0.50
C. 0.75
D. 1.00
Correct Answer: B. 0.50
7. In healthcare research, a sample is:
A. Every member of a population
B. A subset of the population
C. A statistical test
D. A research hypothesis
Correct Answer: B. A subset of the population
8. Which correlation coefficient indicates the strongest positive relationship?
A. -0.90
B. 0.00
C. 0.45
D. 0.95
Correct Answer: D. 0.95
,9. A p-value less than 0.05 generally suggests:
A. No relationship exists
B. Results are statistically significant
C. The sample is invalid
D. The study must be repeated
Correct Answer: B. Results are statistically significant
10. What is the primary purpose of inferential statistics?
A. Organize data
B. Create graphs
C. Draw conclusions about a population from a sample
D. Calculate percentages only
Correct Answer: C. Draw conclusions about a population from a sample
11. Which measure identifies the most frequently occurring value?
A. Mean
B. Median
C. Mode
D. Variance
Correct Answer: C. Mode
12. A scatterplot is commonly used to evaluate:
A. Frequency distributions
B. Relationships between two variables
C. Categorical data
D. Population size
Correct Answer: B. Relationships between two variables
13. If patient age increases as blood pressure increases, the relationship is:
A. Negative correlation
B. Positive correlation
C. No correlation
D. Random variation
, Correct Answer: B. Positive correlation
14. What is the range of the numbers 4, 8, 12, 20?
A. 12
B. 16
C. 20
D. 24
Correct Answer: B. 16
Explanation: Range = Highest value − Lowest value = 20 − 4.
15. In a normal distribution:
A. Mean, median, and mode are equal
B. The mean is always larger than the median
C. The median is always larger than the mode
D. There is no center value
Correct Answer: A. Mean, median, and mode are equal
16. Which of the following is an example of a continuous variable?
A. Blood type
B. Gender
C. Height
D. Marital status
Correct Answer: C. Height
Explanation: Continuous variables can take any value within a range.
17. What does a negative correlation indicate?
A. Both variables increase together
B. Both variables decrease together
C. One variable increases as the other decreases
D. No relationship exists
Correct Answer: C. One variable increases as the other decreases
18. Which statistical measure represents the average squared deviation from the mean?
STATISTICS – PRACTICE 200+
QUESTIONS & ANSWERS A+ VERIFIED
LATEST VERSION 2026-2027 (ORIGINAL
STUDY MATERIAL)
1. Which measure of central tendency is most affected by extreme values?
A. Mode
B. Median
C. Mean
D. Range
Correct Answer: C. Mean
Explanation: The mean uses every value in the dataset, making it sensitive to outliers.
2. A dataset contains the values: 10, 12, 15, 15, 18. What is the median?
A. 12
B. 15
C. 14
D. 18
Correct Answer: B. 15
Explanation: The median is the middle value when data are arranged in order.
3. What does a standard deviation measure?
A. The average value
B. The most frequent value
C. The spread of data around the mean
D. The sample size
Correct Answer: C. The spread of data around the mean
,4. Which graph is best for displaying categorical data?
A. Histogram
B. Scatterplot
C. Bar chart
D. Line graph
Correct Answer: C. Bar chart
5. A probability of 0 indicates:
A. Certainty
B. An impossible event
C. A likely event
D. A random event
Correct Answer: B. An impossible event
6. What is the probability of obtaining heads on a fair coin toss?
A. 0.25
B. 0.50
C. 0.75
D. 1.00
Correct Answer: B. 0.50
7. In healthcare research, a sample is:
A. Every member of a population
B. A subset of the population
C. A statistical test
D. A research hypothesis
Correct Answer: B. A subset of the population
8. Which correlation coefficient indicates the strongest positive relationship?
A. -0.90
B. 0.00
C. 0.45
D. 0.95
Correct Answer: D. 0.95
,9. A p-value less than 0.05 generally suggests:
A. No relationship exists
B. Results are statistically significant
C. The sample is invalid
D. The study must be repeated
Correct Answer: B. Results are statistically significant
10. What is the primary purpose of inferential statistics?
A. Organize data
B. Create graphs
C. Draw conclusions about a population from a sample
D. Calculate percentages only
Correct Answer: C. Draw conclusions about a population from a sample
11. Which measure identifies the most frequently occurring value?
A. Mean
B. Median
C. Mode
D. Variance
Correct Answer: C. Mode
12. A scatterplot is commonly used to evaluate:
A. Frequency distributions
B. Relationships between two variables
C. Categorical data
D. Population size
Correct Answer: B. Relationships between two variables
13. If patient age increases as blood pressure increases, the relationship is:
A. Negative correlation
B. Positive correlation
C. No correlation
D. Random variation
, Correct Answer: B. Positive correlation
14. What is the range of the numbers 4, 8, 12, 20?
A. 12
B. 16
C. 20
D. 24
Correct Answer: B. 16
Explanation: Range = Highest value − Lowest value = 20 − 4.
15. In a normal distribution:
A. Mean, median, and mode are equal
B. The mean is always larger than the median
C. The median is always larger than the mode
D. There is no center value
Correct Answer: A. Mean, median, and mode are equal
16. Which of the following is an example of a continuous variable?
A. Blood type
B. Gender
C. Height
D. Marital status
Correct Answer: C. Height
Explanation: Continuous variables can take any value within a range.
17. What does a negative correlation indicate?
A. Both variables increase together
B. Both variables decrease together
C. One variable increases as the other decreases
D. No relationship exists
Correct Answer: C. One variable increases as the other decreases
18. Which statistical measure represents the average squared deviation from the mean?
