WGU C784 APPLIED HEALTHCARE
STATISTICS OBJECTIVE ASSESSMENT
2026/2027 Complete Questions and Answer
1.A researcher records the number of hospital visits made by each patient in a
month. What type of data is this?
A. Nominal
B. Ordinal
C. Discrete quantitative
D. Continuous quantitative
Correct answer: C
Rationale: Count data are discrete because they take whole-number values only.
2. Which measure is most affected by an extreme outlier?
A. Median
B. Mode
C. Mean
D. Range
Correct answer: C
Rationale: The mean uses every value, so a very large or small outlier changes it
the most.
3. A dataset has values 2, 4, 4, 6, 100. Which measure best represents the center?
A. Mean
B. Median
C. Range
D. Standard deviation
Correct answer: B
Rationale: The outlier 100 pulls the mean upward, while the median stays
resistant to skew.
4. Which sampling method gives every member of the population an equal chance
of selection?
A. Convenience sampling
B. Stratified sampling
C. Simple random sampling
,D. Quota sampling
Correct answer: C
Rationale: Simple random sampling is the classic equal-probability method.
5. A nurse classifies patients as diabetic or non-diabetic. This variable is:
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Correct answer: A
Rationale: The categories have no natural ranking.
6. What does a p-value represent?
A. The probability that the null hypothesis is true
B. The probability of observing results at least as extreme as the sample results,
assuming the null is true
C. The probability the study is biased
D. The probability the alternative hypothesis is true
Correct answer: B
Rationale: That is the standard interpretation of a p-value in hypothesis testing.
7. If a study reports a 95% confidence interval for a mean difference that does not
include 0, what does this suggest?
A. The result is not statistically significant
B. The result is statistically significant at the 0.05 level
C. The null hypothesis must be accepted
D. The sample size was too small to interpret
Correct answer: B
Rationale: For a difference, excluding 0 suggests significance at alpha 0.05.
8. Which chart is best for showing the distribution of a continuous variable?
A. Pie chart
B. Histogram
C. Bar chart
D. Scatterplot
Correct answer: B
Rationale: Histograms display how continuous data are spread across intervals.
9. A researcher wants to know whether blood pressure is related to age. Which
statistic is most appropriate?
, A. Correlation coefficient
B. Mode
C. Median
D. Frequency table
Correct answer: A
Rationale: Correlation measures the strength and direction of a linear relationship.
10. Which statement about standard deviation is correct?
A. It measures the center of data
B. It measures spread around the mean
C. It is always smaller than the variance
D. It only applies to nominal data
Correct answer: B
Rationale: Standard deviation describes typical distance from the mean.
11. A variable measured in categories with a meaningful order, such as mild,
moderate, severe, is:
A. Nominal
B. Ordinal
C. Ratio
D. Interval
Correct answer: B
Rationale: Ordered categories without equal numerical spacing are ordinal.
12. Which is the best test for comparing the means of two independent groups
when assumptions are met?
A. Paired t-test
B. One-sample t-test
C. Independent samples t-test
D. Chi-square test
Correct answer: C
Rationale: Independent groups require an independent samples t-test.
13. What is the main purpose of a null hypothesis?
A. To prove the researcher is correct
B. To represent no effect or no difference
C. To guarantee a significant result
D. To replace the need for a sample
Correct answer: B
STATISTICS OBJECTIVE ASSESSMENT
2026/2027 Complete Questions and Answer
1.A researcher records the number of hospital visits made by each patient in a
month. What type of data is this?
A. Nominal
B. Ordinal
C. Discrete quantitative
D. Continuous quantitative
Correct answer: C
Rationale: Count data are discrete because they take whole-number values only.
2. Which measure is most affected by an extreme outlier?
A. Median
B. Mode
C. Mean
D. Range
Correct answer: C
Rationale: The mean uses every value, so a very large or small outlier changes it
the most.
3. A dataset has values 2, 4, 4, 6, 100. Which measure best represents the center?
A. Mean
B. Median
C. Range
D. Standard deviation
Correct answer: B
Rationale: The outlier 100 pulls the mean upward, while the median stays
resistant to skew.
4. Which sampling method gives every member of the population an equal chance
of selection?
A. Convenience sampling
B. Stratified sampling
C. Simple random sampling
,D. Quota sampling
Correct answer: C
Rationale: Simple random sampling is the classic equal-probability method.
5. A nurse classifies patients as diabetic or non-diabetic. This variable is:
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Correct answer: A
Rationale: The categories have no natural ranking.
6. What does a p-value represent?
A. The probability that the null hypothesis is true
B. The probability of observing results at least as extreme as the sample results,
assuming the null is true
C. The probability the study is biased
D. The probability the alternative hypothesis is true
Correct answer: B
Rationale: That is the standard interpretation of a p-value in hypothesis testing.
7. If a study reports a 95% confidence interval for a mean difference that does not
include 0, what does this suggest?
A. The result is not statistically significant
B. The result is statistically significant at the 0.05 level
C. The null hypothesis must be accepted
D. The sample size was too small to interpret
Correct answer: B
Rationale: For a difference, excluding 0 suggests significance at alpha 0.05.
8. Which chart is best for showing the distribution of a continuous variable?
A. Pie chart
B. Histogram
C. Bar chart
D. Scatterplot
Correct answer: B
Rationale: Histograms display how continuous data are spread across intervals.
9. A researcher wants to know whether blood pressure is related to age. Which
statistic is most appropriate?
, A. Correlation coefficient
B. Mode
C. Median
D. Frequency table
Correct answer: A
Rationale: Correlation measures the strength and direction of a linear relationship.
10. Which statement about standard deviation is correct?
A. It measures the center of data
B. It measures spread around the mean
C. It is always smaller than the variance
D. It only applies to nominal data
Correct answer: B
Rationale: Standard deviation describes typical distance from the mean.
11. A variable measured in categories with a meaningful order, such as mild,
moderate, severe, is:
A. Nominal
B. Ordinal
C. Ratio
D. Interval
Correct answer: B
Rationale: Ordered categories without equal numerical spacing are ordinal.
12. Which is the best test for comparing the means of two independent groups
when assumptions are met?
A. Paired t-test
B. One-sample t-test
C. Independent samples t-test
D. Chi-square test
Correct answer: C
Rationale: Independent groups require an independent samples t-test.
13. What is the main purpose of a null hypothesis?
A. To prove the researcher is correct
B. To represent no effect or no difference
C. To guarantee a significant result
D. To replace the need for a sample
Correct answer: B
