1
WGU C207 Data-Driven Decision
Making Final Exam (2025/2026) –
Verified Questions and Accurate
Answers | A+ Grade Guaranteed
Question 1
Which measure of central tendency is most affected by extreme values in a dataset?
A. Mean
B. Median
C. Mode
D. Midrange
Correct Answer: A. Mean
Explanation: The mean is calculated by summing all values and dividing by the count, making it
sensitive to extreme values. Median, mode, and midrange are less affected as they focus on
central or frequent values.
Question 2
What does a standard deviation of 0 indicate about a dataset?
A. No variability
B. High variability
C. Normal distribution
D. Skewed distribution
Correct Answer: A. No variability
Explanation: A standard deviation of 0 means all values in the dataset are identical, indicating
no variability. Other options describe different distribution characteristics.
Question 3
In hypothesis testing, what is the null hypothesis typically stated as?
A. There is a significant difference
B. There is no effect or difference
, 2
C. The sample mean equals the population mean
D. The data is normally distributed
Correct Answer: B. There is no effect or difference
Explanation: The null hypothesis (H₀) assumes no effect or difference between groups or
variables, serving as the baseline for testing.
Question 4
Which graph is best for showing the distribution of a continuous variable?
A. Bar chart
B. Histogram
C. Pie chart
D. Scatter plot
Correct Answer: B. Histogram
Explanation: A histogram displays the distribution of a continuous variable by grouping data
into bins, showing frequency. Bar charts are for categorical data, pie charts for proportions, and
scatter plots for relationships.
Question 5
What is a key ethical concern in data analysis?
A. Using complex algorithms
B. Protecting data privacy
C. Increasing sample size
D. Choosing graph types
Correct Answer: B. Protecting data privacy
Explanation: Protecting data privacy ensures sensitive information is secure and complies with
regulations like GDPR, a critical ethical concern in data analysis.
Question 6
What does a p-value of 0.03 indicate in hypothesis testing?
A. 3% chance of rejecting the null hypothesis
B. 3% chance the null hypothesis is true
C. 3% probability of a Type I error if null is rejected
D. 97% confidence in the null hypothesis
, 3
Correct Answer: C. 3% probability of a Type I error if null is rejected
Explanation: A p-value of 0.03 indicates a 3% chance of incorrectly rejecting the null
hypothesis (Type I error) if it is true, assuming a significance level of 0.05.
Question 7
Which descriptive statistic measures the spread of data around the mean?
A. Median
B. Variance
C. Mode
D. Midrange
Correct Answer: B. Variance
Explanation: Variance measures how far data points deviate from the mean, quantifying spread.
Median and mode describe central tendency, and midrange is a simple range measure.
Question 8
In inferential reasoning, what is the purpose of a confidence interval?
A. Estimate the sample mean
B. Provide a range for a population parameter
C. Determine the exact population mean
D. Test the null hypothesis
Correct Answer: B. Provide a range for a population parameter
Explanation: A confidence interval estimates a range within which the true population
parameter likely lies, based on sample data.
Question 9
Which graph is best for comparing categorical data across groups?
A. Histogram
B. Bar chart
C. Line graph
D. Box plot
Correct Answer: B. Bar chart
Explanation: Bar charts compare categorical data across groups using distinct bars, making
differences clear. Histograms are for continuous data, line graphs for trends, and box plots for
distribution.
WGU C207 Data-Driven Decision
Making Final Exam (2025/2026) –
Verified Questions and Accurate
Answers | A+ Grade Guaranteed
Question 1
Which measure of central tendency is most affected by extreme values in a dataset?
A. Mean
B. Median
C. Mode
D. Midrange
Correct Answer: A. Mean
Explanation: The mean is calculated by summing all values and dividing by the count, making it
sensitive to extreme values. Median, mode, and midrange are less affected as they focus on
central or frequent values.
Question 2
What does a standard deviation of 0 indicate about a dataset?
A. No variability
B. High variability
C. Normal distribution
D. Skewed distribution
Correct Answer: A. No variability
Explanation: A standard deviation of 0 means all values in the dataset are identical, indicating
no variability. Other options describe different distribution characteristics.
Question 3
In hypothesis testing, what is the null hypothesis typically stated as?
A. There is a significant difference
B. There is no effect or difference
, 2
C. The sample mean equals the population mean
D. The data is normally distributed
Correct Answer: B. There is no effect or difference
Explanation: The null hypothesis (H₀) assumes no effect or difference between groups or
variables, serving as the baseline for testing.
Question 4
Which graph is best for showing the distribution of a continuous variable?
A. Bar chart
B. Histogram
C. Pie chart
D. Scatter plot
Correct Answer: B. Histogram
Explanation: A histogram displays the distribution of a continuous variable by grouping data
into bins, showing frequency. Bar charts are for categorical data, pie charts for proportions, and
scatter plots for relationships.
Question 5
What is a key ethical concern in data analysis?
A. Using complex algorithms
B. Protecting data privacy
C. Increasing sample size
D. Choosing graph types
Correct Answer: B. Protecting data privacy
Explanation: Protecting data privacy ensures sensitive information is secure and complies with
regulations like GDPR, a critical ethical concern in data analysis.
Question 6
What does a p-value of 0.03 indicate in hypothesis testing?
A. 3% chance of rejecting the null hypothesis
B. 3% chance the null hypothesis is true
C. 3% probability of a Type I error if null is rejected
D. 97% confidence in the null hypothesis
, 3
Correct Answer: C. 3% probability of a Type I error if null is rejected
Explanation: A p-value of 0.03 indicates a 3% chance of incorrectly rejecting the null
hypothesis (Type I error) if it is true, assuming a significance level of 0.05.
Question 7
Which descriptive statistic measures the spread of data around the mean?
A. Median
B. Variance
C. Mode
D. Midrange
Correct Answer: B. Variance
Explanation: Variance measures how far data points deviate from the mean, quantifying spread.
Median and mode describe central tendency, and midrange is a simple range measure.
Question 8
In inferential reasoning, what is the purpose of a confidence interval?
A. Estimate the sample mean
B. Provide a range for a population parameter
C. Determine the exact population mean
D. Test the null hypothesis
Correct Answer: B. Provide a range for a population parameter
Explanation: A confidence interval estimates a range within which the true population
parameter likely lies, based on sample data.
Question 9
Which graph is best for comparing categorical data across groups?
A. Histogram
B. Bar chart
C. Line graph
D. Box plot
Correct Answer: B. Bar chart
Explanation: Bar charts compare categorical data across groups using distinct bars, making
differences clear. Histograms are for continuous data, line graphs for trends, and box plots for
distribution.
