1
WGU C784 OBJECTIVE ASSESSMENT 2026/2027 |
APPLIED HEALTHCARE STATISTICS | EXPERT
VERIFIED | 125 VERIFIED Q&A | DETAILED
RATIONALES | PASS GUARANTEED – A+ GRADED
Question 1
A nurse is reviewing the concept of descriptive statistics. Which of the following is a measure of
central tendency?
A. Standard deviation
B. Mean
C. Range
D. Variance
Correct Answer: B
Rationale: The mean is a measure of central tendency along with median and mode. Standard
deviation, range, and variance are measures of variability.
Question 2
A nurse is calculating the mean of the following data set: 5, 7, 9, 11, 13. What is the mean?
A. 7
B. 8
C. 9
D. 10
Correct Answer: C
Rationale: The mean is the sum of values divided by the number of values: (5+7+9+11+13)/5 = 45/5
= 9.
Question 3
A nurse is identifying the median of the following data set: 3, 5, 7, 9, 11. What is the median?
A. 5
B. 6
C. 7
D. 8
Correct Answer: C
Rationale: The median is the middle value when data is ordered: 3, 5, 7, 9, 11 → median = 7.
,2
Question 4
A nurse is identifying the mode of the following data set: 2, 4, 4, 6, 8. What is the mode?
A. 2
B. 4
C. 6
D. 8
Correct Answer: B
Rationale: The mode is the most frequently occurring value: 4 appears twice.
Question 5
A nurse is calculating the range of the following data set: 10, 15, 20, 25, 30. What is the range?
A. 15
B. 20
C. 25
D. 30
Correct Answer: B
Rationale: Range = maximum - minimum = 30 - 10 = 20.
Question 6
A nurse is reviewing the concept of standard deviation. Which of the following best describes
standard deviation?
A. The average distance from the mean
B. The middle value
C. The most frequent value
D. The difference between maximum and minimum
Correct Answer: A
Rationale: Standard deviation measures the average distance of data points from the mean.
Question 7
A nurse is reviewing the concept of probability. Which of the following is the probability of a certain
event?
A. 0
B. 0.5
C. 1
D. 2
Correct Answer: C
,3
Rationale: Probability ranges from 0 (impossible) to 1 (certain).
Question 8
A nurse is reviewing the concept of a null hypothesis. Which of the following best describes a null
hypothesis?
A. A statement that there is an effect
B. A statement that there is no effect or difference
C. A statement that is always true
D. A statement that is always false
Correct Answer: B
Rationale: The null hypothesis states there is no effect or difference.
Question 9
A nurse is reviewing the concept of statistical significance. Which p-value is typically considered
statistically significant?
A. p > 0.10
B. p > 0.05
C. p < 0.05
D. p = 0.50
Correct Answer: C
Rationale: A p-value < 0.05 is typically considered statistically significant.
Question 10
A nurse is reviewing the concept of a Type I error. Which of the following best describes a Type I
error?
A. Rejecting a true null hypothesis
B. Failing to reject a false null hypothesis
C. Accepting a true null hypothesis
D. Rejecting a false null hypothesis
Correct Answer: A
Rationale: A Type I error is rejecting a true null hypothesis (false positive).
Question 11
A nurse is reviewing the concept of a Type II error. Which of the following best describes a Type II
error?
, 4
A. Rejecting a true null hypothesis
B. Failing to reject a false null hypothesis
C. Accepting a true null hypothesis
D. Rejecting a false null hypothesis
Correct Answer: B
Rationale: A Type II error is failing to reject a false null hypothesis (false negative).
Question 12
A nurse is reviewing the concept of sensitivity. Which of the following best describes sensitivity?
A. The ability to correctly identify those without the disease
B. The ability to correctly identify those with the disease
C. The proportion of negative results that are true negatives
D. The proportion of positive results that are true positives
Correct Answer: B
Rationale: Sensitivity is the ability to correctly identify true positives (those with the disease).
Question 13
A nurse is reviewing the concept of specificity. Which of the following best describes specificity?
A. The ability to correctly identify those without the disease
B. The ability to correctly identify those with the disease
C. The proportion of positive results that are true positives
D. The proportion of negative results that are true negatives
Correct Answer: A
Rationale: Specificity is the ability to correctly identify true negatives (those without the disease).
Question 14
A nurse is reviewing the concept of positive predictive value (PPV). Which of the following best
describes PPV?
A. The proportion of those with a positive test who have the disease
B. The proportion of those with a negative test who do not have the disease
C. The ability to correctly identify true positives
D. The ability to correctly identify true negatives
Correct Answer: A
Rationale: PPV is the proportion of positive test results that are true positives.
Question 15
WGU C784 OBJECTIVE ASSESSMENT 2026/2027 |
APPLIED HEALTHCARE STATISTICS | EXPERT
VERIFIED | 125 VERIFIED Q&A | DETAILED
RATIONALES | PASS GUARANTEED – A+ GRADED
Question 1
A nurse is reviewing the concept of descriptive statistics. Which of the following is a measure of
central tendency?
A. Standard deviation
B. Mean
C. Range
D. Variance
Correct Answer: B
Rationale: The mean is a measure of central tendency along with median and mode. Standard
deviation, range, and variance are measures of variability.
Question 2
A nurse is calculating the mean of the following data set: 5, 7, 9, 11, 13. What is the mean?
A. 7
B. 8
C. 9
D. 10
Correct Answer: C
Rationale: The mean is the sum of values divided by the number of values: (5+7+9+11+13)/5 = 45/5
= 9.
Question 3
A nurse is identifying the median of the following data set: 3, 5, 7, 9, 11. What is the median?
A. 5
B. 6
C. 7
D. 8
Correct Answer: C
Rationale: The median is the middle value when data is ordered: 3, 5, 7, 9, 11 → median = 7.
,2
Question 4
A nurse is identifying the mode of the following data set: 2, 4, 4, 6, 8. What is the mode?
A. 2
B. 4
C. 6
D. 8
Correct Answer: B
Rationale: The mode is the most frequently occurring value: 4 appears twice.
Question 5
A nurse is calculating the range of the following data set: 10, 15, 20, 25, 30. What is the range?
A. 15
B. 20
C. 25
D. 30
Correct Answer: B
Rationale: Range = maximum - minimum = 30 - 10 = 20.
Question 6
A nurse is reviewing the concept of standard deviation. Which of the following best describes
standard deviation?
A. The average distance from the mean
B. The middle value
C. The most frequent value
D. The difference between maximum and minimum
Correct Answer: A
Rationale: Standard deviation measures the average distance of data points from the mean.
Question 7
A nurse is reviewing the concept of probability. Which of the following is the probability of a certain
event?
A. 0
B. 0.5
C. 1
D. 2
Correct Answer: C
,3
Rationale: Probability ranges from 0 (impossible) to 1 (certain).
Question 8
A nurse is reviewing the concept of a null hypothesis. Which of the following best describes a null
hypothesis?
A. A statement that there is an effect
B. A statement that there is no effect or difference
C. A statement that is always true
D. A statement that is always false
Correct Answer: B
Rationale: The null hypothesis states there is no effect or difference.
Question 9
A nurse is reviewing the concept of statistical significance. Which p-value is typically considered
statistically significant?
A. p > 0.10
B. p > 0.05
C. p < 0.05
D. p = 0.50
Correct Answer: C
Rationale: A p-value < 0.05 is typically considered statistically significant.
Question 10
A nurse is reviewing the concept of a Type I error. Which of the following best describes a Type I
error?
A. Rejecting a true null hypothesis
B. Failing to reject a false null hypothesis
C. Accepting a true null hypothesis
D. Rejecting a false null hypothesis
Correct Answer: A
Rationale: A Type I error is rejecting a true null hypothesis (false positive).
Question 11
A nurse is reviewing the concept of a Type II error. Which of the following best describes a Type II
error?
, 4
A. Rejecting a true null hypothesis
B. Failing to reject a false null hypothesis
C. Accepting a true null hypothesis
D. Rejecting a false null hypothesis
Correct Answer: B
Rationale: A Type II error is failing to reject a false null hypothesis (false negative).
Question 12
A nurse is reviewing the concept of sensitivity. Which of the following best describes sensitivity?
A. The ability to correctly identify those without the disease
B. The ability to correctly identify those with the disease
C. The proportion of negative results that are true negatives
D. The proportion of positive results that are true positives
Correct Answer: B
Rationale: Sensitivity is the ability to correctly identify true positives (those with the disease).
Question 13
A nurse is reviewing the concept of specificity. Which of the following best describes specificity?
A. The ability to correctly identify those without the disease
B. The ability to correctly identify those with the disease
C. The proportion of positive results that are true positives
D. The proportion of negative results that are true negatives
Correct Answer: A
Rationale: Specificity is the ability to correctly identify true negatives (those without the disease).
Question 14
A nurse is reviewing the concept of positive predictive value (PPV). Which of the following best
describes PPV?
A. The proportion of those with a positive test who have the disease
B. The proportion of those with a negative test who do not have the disease
C. The ability to correctly identify true positives
D. The ability to correctly identify true negatives
Correct Answer: A
Rationale: PPV is the proportion of positive test results that are true positives.
Question 15
