WGU D772 Statistical Data Literacy Exam Prep: 200 Questions Covering Sampling, Regression, Hypothesis Testing, and Data Visualization with Detailed Explanations

WGU D772 Statistical Data Literacy Exam Prep:
200 Questions Covering Sampling, Regression,
Hypothesis Testing, and Data Visualization with
Detailed Explanations


WGU D772 Practice Exam: Core Concepts


Question 1: A researcher collects the zip codes of
survey participants. What level of measurement are
zip codes?
• A) Nominal
• B) Ordinal
• C) Interval
• D) Ratio
☑VERIFIED ANSWER & Rationale:
☑VERIFIED ANSWER: A) Nominal
Rationale: Zip codes are categories used as labels

,with no inherent order or meaningful numeric
difference. This makes them nominal data .
Question 2: A school measures students' grade-
point averages (GPAs) on a 4.0 scale. What type of
data is GPA?
• A) Nominal
• B) Ordinal
• C) Interval
• D) Ratio
☑VERIFIED ANSWER & Rationale:
☑VERIFIED ANSWER: D) Ratio
Rationale: GPA has a true zero point (0.0), equal
intervals between values, and ratios are meaningful
(e.g., a 3.0 is twice as high as a 1.5). This qualifies it
as ratio data .
Question 3: A psychologist splits participants into
four groups and gives each a maze with a different

,color. The time to solve the maze is recorded. What
is the explanatory variable?
• A) The time to solve the maze
• B) The specific maze color
• C) The participants' ages
• D) The difficulty of the maze
☑VERIFIED ANSWER & Rationale:
☑VERIFIED ANSWER: B) The specific maze color
Rationale: The explanatory variable (independent
variable) is the one manipulated by the researcher
to see if it causes an effect on the response variable
(solve time) .
Question 4: In a boxplot, points plotted beyond the
whiskers are typically considered:
• A) The maximum and minimum values
• B) Potential outliers
• C) The median values
• D) The mode of the distribution

, ☑VERIFIED ANSWER & Rationale:
☑VERIFIED ANSWER: B) Potential outliers
Rationale: Points outside the whiskers (usually
defined as 1.5 times the IQR beyond Q1 or Q3) are
commonly flagged as potential outliers .
Question 5: A dataset has a strong positive skew.
Which statement is likely true?
• A) Mean > median
• B) Mean < median
• C) Mean = median
• D) No relationship between mean and median
☑VERIFIED ANSWER & Rationale:
☑VERIFIED ANSWER: A) Mean > median
Rationale: In a positively skewed distribution, the
tail on the right pulls the mean to be greater than
the median .