WGU C207 DATA-DRIVEN DECISION-
MAKING COMPREHENSIVE EXAM
QUESTIONS AND ANSWERS
1. A researcher is measuring the temperature of a chemical reaction in degrees Celsius. Which
level of data measurement is this?
A. Nominal
B. Interval
C. Ordinal
D. Ratio
Answer: B
Conceptual Explanation: Interval data has meaningful distances between values but lacks
a true zero point. Celsius is interval because 0 degrees does not represent the absence of
temperature.
2. In a multiple regression analysis, what does the R-squared value represent?
A. The probability that the null hypothesis is true.
B. The average error in the prediction model.
,C. The strength and direction of the linear relationship between two variables.
D. The proportion of variance in the dependent variable explained by the independent
variables.
Answer: D
Conceptual Explanation: R-squared, or the coefficient of determination, measures how
well the statistical model predicts the outcome by showing the percentage of variance
explained.
3. Which of the following best describes a Type II error?
A. Rejecting a true null hypothesis.
B. Setting the alpha level too high.
C. Failing to reject a false null hypothesis.
D. Incorrectly assuming a correlation implies causation.
Answer: C
Conceptual Explanation: A Type II error (false negative) occurs when the researcher fails
to reject a null hypothesis that is actually false.
4. A Six Sigma process aims for a defect rate of no more than how many defects per million
opportunities (DPMO)?
A. 3.4
B. 6.0
, C. 66.8
D. 233
Answer: A
Conceptual Explanation: The statistical goal of Six Sigma is to achieve 3.4 defects per
million opportunities, representing near perfection.
5. Which tool is most effective for identifying the ‘vital few’ causes of a problem based on
frequency?
A. Scatter Plot
B. Pareto Chart
C. Control Chart
D. Fishbone Diagram
Answer: B
Conceptual Explanation: A Pareto Chart follows the 80/20 rule, helping to identify the
20% of causes that result in 80% of the problems.
6. If a distribution is highly skewed to the right, which measure of central tendency is typically
the largest?
A. Standard Deviation
B. Median
C. Mode
MAKING COMPREHENSIVE EXAM
QUESTIONS AND ANSWERS
1. A researcher is measuring the temperature of a chemical reaction in degrees Celsius. Which
level of data measurement is this?
A. Nominal
B. Interval
C. Ordinal
D. Ratio
Answer: B
Conceptual Explanation: Interval data has meaningful distances between values but lacks
a true zero point. Celsius is interval because 0 degrees does not represent the absence of
temperature.
2. In a multiple regression analysis, what does the R-squared value represent?
A. The probability that the null hypothesis is true.
B. The average error in the prediction model.
,C. The strength and direction of the linear relationship between two variables.
D. The proportion of variance in the dependent variable explained by the independent
variables.
Answer: D
Conceptual Explanation: R-squared, or the coefficient of determination, measures how
well the statistical model predicts the outcome by showing the percentage of variance
explained.
3. Which of the following best describes a Type II error?
A. Rejecting a true null hypothesis.
B. Setting the alpha level too high.
C. Failing to reject a false null hypothesis.
D. Incorrectly assuming a correlation implies causation.
Answer: C
Conceptual Explanation: A Type II error (false negative) occurs when the researcher fails
to reject a null hypothesis that is actually false.
4. A Six Sigma process aims for a defect rate of no more than how many defects per million
opportunities (DPMO)?
A. 3.4
B. 6.0
, C. 66.8
D. 233
Answer: A
Conceptual Explanation: The statistical goal of Six Sigma is to achieve 3.4 defects per
million opportunities, representing near perfection.
5. Which tool is most effective for identifying the ‘vital few’ causes of a problem based on
frequency?
A. Scatter Plot
B. Pareto Chart
C. Control Chart
D. Fishbone Diagram
Answer: B
Conceptual Explanation: A Pareto Chart follows the 80/20 rule, helping to identify the
20% of causes that result in 80% of the problems.
6. If a distribution is highly skewed to the right, which measure of central tendency is typically
the largest?
A. Standard Deviation
B. Median
C. Mode
