C784 Applied Healthcare Statistics Practice Exam 2026 |WGU
1. Which level of measurement is used for classifying patients by their blood
type (A, B, AB, O)?
A. Ordinal
B. Nominal
C. Interval
D. Ratio
Answer: B
Rationale: Nominal data represents categories that do not have a natural order or ranking.
2. In a dataset where the values are 5, 7, 7, 8, 10, 15, and 200, which measure of
central tendency is most affected by the outlier?
A. Mode
B. Median
C. Mean
D. Range
Answer: C
Rationale: The mean is calculated by summing all values; therefore, extreme outliers pull
the mean significantly in their direction.
,3. What is the probability of an event that is certain to occur?
A. 1.0
B. 0.0
C. 0.5
D. -1.0
Answer: A
Rationale: Probabilities range from 0 (impossible) to 1 (certain).
4. A researcher fails to reject a null hypothesis that is actually false. What type
of error is this?
A. Type I error
B. Standard error
C. Type II error
D. Sampling error
Answer: C
Rationale: Type II error occurs when the null hypothesis is false, but the researcher fails to
reject it.
5. Which of the following correlation coefficients indicates the strongest linear
relationship?
A. 0.75
B. 0.10
C. -0.85
D. -0.50
Answer: C
Rationale: The strength of a correlation is determined by the absolute value. 0.85 is higher
than 0.75.
, 6. What does a p-value of 0.03 indicate if the alpha level is set at 0.05?
A. The results are not statistically significant.
B. The results are statistically significant.
C. The null hypothesis should be accepted.
D. There is a 3% chance the null hypothesis is true.
Answer: B
Rationale: When the p-value is less than or equal to the alpha level, the results are
considered statistically significant.
7. In a normal distribution, approximately what percentage of data falls within
one standard deviation of the mean?
A. 50%
B. 99.7%
C. 95%
D. 68%
Answer: D
Rationale: According to the empirical rule, about 68% of data falls within one standard
deviation of the mean in a normal distribution.
8. Which statistical test is most appropriate for comparing the means of three or
more independent groups?
A. T-test
B. Chi-square
C. ANOVA
D. Linear Regression
Answer: C
Rationale: ANOVA (Analysis of Variance) is used to compare the means of three or more
groups.
1. Which level of measurement is used for classifying patients by their blood
type (A, B, AB, O)?
A. Ordinal
B. Nominal
C. Interval
D. Ratio
Answer: B
Rationale: Nominal data represents categories that do not have a natural order or ranking.
2. In a dataset where the values are 5, 7, 7, 8, 10, 15, and 200, which measure of
central tendency is most affected by the outlier?
A. Mode
B. Median
C. Mean
D. Range
Answer: C
Rationale: The mean is calculated by summing all values; therefore, extreme outliers pull
the mean significantly in their direction.
,3. What is the probability of an event that is certain to occur?
A. 1.0
B. 0.0
C. 0.5
D. -1.0
Answer: A
Rationale: Probabilities range from 0 (impossible) to 1 (certain).
4. A researcher fails to reject a null hypothesis that is actually false. What type
of error is this?
A. Type I error
B. Standard error
C. Type II error
D. Sampling error
Answer: C
Rationale: Type II error occurs when the null hypothesis is false, but the researcher fails to
reject it.
5. Which of the following correlation coefficients indicates the strongest linear
relationship?
A. 0.75
B. 0.10
C. -0.85
D. -0.50
Answer: C
Rationale: The strength of a correlation is determined by the absolute value. 0.85 is higher
than 0.75.
, 6. What does a p-value of 0.03 indicate if the alpha level is set at 0.05?
A. The results are not statistically significant.
B. The results are statistically significant.
C. The null hypothesis should be accepted.
D. There is a 3% chance the null hypothesis is true.
Answer: B
Rationale: When the p-value is less than or equal to the alpha level, the results are
considered statistically significant.
7. In a normal distribution, approximately what percentage of data falls within
one standard deviation of the mean?
A. 50%
B. 99.7%
C. 95%
D. 68%
Answer: D
Rationale: According to the empirical rule, about 68% of data falls within one standard
deviation of the mean in a normal distribution.
8. Which statistical test is most appropriate for comparing the means of three or
more independent groups?
A. T-test
B. Chi-square
C. ANOVA
D. Linear Regression
Answer: C
Rationale: ANOVA (Analysis of Variance) is used to compare the means of three or more
groups.
