WGU D204 — The Data Analytics Journey
250 Original Exam-Style Practice Questions • Answers & Rationales Immediately After Each Question
Important: These are original practice questions aligned to common D204 data-analytics concepts. They are not copied or
represented as leaked/current WGU exam questions.
1. [Analytics Foundations] Which type of analytics focuses on summarizing what has already happened?
A. Predictive
B. Prescriptive
C. Descriptive
D. Diagnostic
Correct Answer: C. Descriptive
Rationale: Descriptive analytics summarizes historical data to explain what happened.
2. [Analytics Foundations] Which type of analytics asks why an observed outcome occurred?
A. Descriptive
B. Predictive
C. Prescriptive
D. Diagnostic
Correct Answer: D. Diagnostic
Rationale: Diagnostic analytics investigates causes and relationships behind observed results.
3. [Analytics Foundations] Which type of analytics estimates what is likely to happen next?
A. Diagnostic
B. Prescriptive
C. Descriptive
D. Predictive
Correct Answer: D. Predictive
Rationale: Predictive analytics uses historical patterns and models to estimate future outcomes.
4. [Analytics Foundations] Which type of analytics recommends an action based on predicted outcomes and
constraints?
A. Diagnostic
B. Descriptive
C. Predictive
D. Prescriptive
Correct Answer: D. Prescriptive
Rationale: Prescriptive analytics evaluates alternatives and recommends actions.
,5. [Analytics Foundations] A retailer reports that sales were $2.4 million last quarter. What kind of analytics is
this?
A. Prescriptive
B. Predictive
C. Descriptive
D. Diagnostic
Correct Answer: C. Descriptive
Rationale: Reporting a historical sales total describes what happened.
6. [Analytics Foundations] A hospital uses past admission patterns to estimate next month's patient volume.
What is this?
A. Predictive analytics
B. Data cleansing
C. Descriptive analytics
D. Prescriptive analytics
Correct Answer: A. Predictive analytics
Rationale: Forecasting a future quantity is predictive analytics.
7. [Analytics Foundations] A delivery company compares route alternatives and recommends the route
expected to minimize cost. What is this?
A. Predictive
B. Descriptive
C. Prescriptive
D. Diagnostic
Correct Answer: C. Prescriptive
Rationale: Recommending an action from modeled alternatives is prescriptive analytics.
8. [Analytics Foundations] A dashboard showing monthly revenue trends is primarily an example of which
analytics?
A. Prescriptive
B. Diagnostic
C. Descriptive
D. Predictive
Correct Answer: C. Descriptive
Rationale: A historical trend display summarizes observed performance.
9. [Analytics Foundations] What is the primary purpose of data analytics?
A. To guarantee profit
B. To turn data into useful information for decisions
C. To eliminate all uncertainty
D. To replace organizational judgment
Correct Answer: B. To turn data into useful information for decisions
Rationale: Analytics supports decisions by transforming data into useful evidence; it cannot eliminate uncertainty or guarantee
outcomes.
,10. [Analytics Foundations] Which statement best describes a data-driven decision?
A. A decision supported by relevant evidence and analysis
B. A decision based only on intuition
C. A decision based solely on popularity
D. A decision made without data
Correct Answer: A. A decision supported by relevant evidence and analysis
Rationale: Data-driven decisions use relevant evidence while still requiring human judgment and context.
11. [Data Types and Sources] Which is an example of structured data?
A. A free-form email archive
B. A relational table of customer records
C. A photograph
D. A recorded interview
Correct Answer: B. A relational table of customer records
Rationale: Relational tables organize data into defined rows and columns.
12. [Data Types and Sources] Which is an example of unstructured data?
A. A customer table
B. A database primary key
C. A collection of product photographs
D. A sales fact table
Correct Answer: C. A collection of product photographs
Rationale: Images do not naturally conform to a fixed tabular schema.
13. [Data Types and Sources] Which is semi-structured data?
A. JSON documents containing named fields
B. A printed report
C. A spreadsheet with fixed columns only
D. A numeric array with no metadata
Correct Answer: A. JSON documents containing named fields
Rationale: JSON uses tags or key-value structures while allowing flexible schemas.
14. [Data Types and Sources] What is a primary advantage of collecting first-party data?
A. It is always free
B. It never requires cleaning
C. It is always unbiased
D. It is collected directly by the organization from its own interactions
Correct Answer: D. It is collected directly by the organization from its own interactions
Rationale: First-party data comes directly from an organization's own customers, systems, or interactions; it still can contain bias
or quality problems.
, 15. [Data Types and Sources] Which source is most likely an internal data source?
A. A public weather API
B. A government census website
C. A company's CRM system
D. A competitor's annual report
Correct Answer: C. A company's CRM system
Rationale: A CRM is maintained within an organization and is therefore an internal source.
16. [Data Types and Sources] Which source is an example of external data?
A. An employee scheduling table
B. A public government dataset
C. An organization's payroll system
D. An internal inventory database
Correct Answer: B. A public government dataset
Rationale: Government datasets are external to the organization using them.
17. [Data Types and Sources] What is metadata?
A. Data that describes other data
B. A type of chart
C. A deleted record
D. A duplicate record
Correct Answer: A. Data that describes other data
Rationale: Metadata provides context such as definitions, formats, ownership, or creation dates.
18. [Data Types and Sources] Why is data provenance important?
A. It documents where data came from and how it was transformed
B. It removes the need for governance
C. It guarantees data is correct
D. It replaces validation
Correct Answer: A. It documents where data came from and how it was transformed
Rationale: Provenance supports traceability by documenting source and transformation history.
19. [Data Types and Sources] A field containing ZIP codes is usually best treated as what kind of data?
A. Continuous numeric
B. Categorical/nominal
C. Ratio-scale measurement
D. Boolean only
Correct Answer: B. Categorical/nominal
Rationale: ZIP codes identify locations; arithmetic operations on their numeric-looking values are generally not meaningful.
250 Original Exam-Style Practice Questions • Answers & Rationales Immediately After Each Question
Important: These are original practice questions aligned to common D204 data-analytics concepts. They are not copied or
represented as leaked/current WGU exam questions.
1. [Analytics Foundations] Which type of analytics focuses on summarizing what has already happened?
A. Predictive
B. Prescriptive
C. Descriptive
D. Diagnostic
Correct Answer: C. Descriptive
Rationale: Descriptive analytics summarizes historical data to explain what happened.
2. [Analytics Foundations] Which type of analytics asks why an observed outcome occurred?
A. Descriptive
B. Predictive
C. Prescriptive
D. Diagnostic
Correct Answer: D. Diagnostic
Rationale: Diagnostic analytics investigates causes and relationships behind observed results.
3. [Analytics Foundations] Which type of analytics estimates what is likely to happen next?
A. Diagnostic
B. Prescriptive
C. Descriptive
D. Predictive
Correct Answer: D. Predictive
Rationale: Predictive analytics uses historical patterns and models to estimate future outcomes.
4. [Analytics Foundations] Which type of analytics recommends an action based on predicted outcomes and
constraints?
A. Diagnostic
B. Descriptive
C. Predictive
D. Prescriptive
Correct Answer: D. Prescriptive
Rationale: Prescriptive analytics evaluates alternatives and recommends actions.
,5. [Analytics Foundations] A retailer reports that sales were $2.4 million last quarter. What kind of analytics is
this?
A. Prescriptive
B. Predictive
C. Descriptive
D. Diagnostic
Correct Answer: C. Descriptive
Rationale: Reporting a historical sales total describes what happened.
6. [Analytics Foundations] A hospital uses past admission patterns to estimate next month's patient volume.
What is this?
A. Predictive analytics
B. Data cleansing
C. Descriptive analytics
D. Prescriptive analytics
Correct Answer: A. Predictive analytics
Rationale: Forecasting a future quantity is predictive analytics.
7. [Analytics Foundations] A delivery company compares route alternatives and recommends the route
expected to minimize cost. What is this?
A. Predictive
B. Descriptive
C. Prescriptive
D. Diagnostic
Correct Answer: C. Prescriptive
Rationale: Recommending an action from modeled alternatives is prescriptive analytics.
8. [Analytics Foundations] A dashboard showing monthly revenue trends is primarily an example of which
analytics?
A. Prescriptive
B. Diagnostic
C. Descriptive
D. Predictive
Correct Answer: C. Descriptive
Rationale: A historical trend display summarizes observed performance.
9. [Analytics Foundations] What is the primary purpose of data analytics?
A. To guarantee profit
B. To turn data into useful information for decisions
C. To eliminate all uncertainty
D. To replace organizational judgment
Correct Answer: B. To turn data into useful information for decisions
Rationale: Analytics supports decisions by transforming data into useful evidence; it cannot eliminate uncertainty or guarantee
outcomes.
,10. [Analytics Foundations] Which statement best describes a data-driven decision?
A. A decision supported by relevant evidence and analysis
B. A decision based only on intuition
C. A decision based solely on popularity
D. A decision made without data
Correct Answer: A. A decision supported by relevant evidence and analysis
Rationale: Data-driven decisions use relevant evidence while still requiring human judgment and context.
11. [Data Types and Sources] Which is an example of structured data?
A. A free-form email archive
B. A relational table of customer records
C. A photograph
D. A recorded interview
Correct Answer: B. A relational table of customer records
Rationale: Relational tables organize data into defined rows and columns.
12. [Data Types and Sources] Which is an example of unstructured data?
A. A customer table
B. A database primary key
C. A collection of product photographs
D. A sales fact table
Correct Answer: C. A collection of product photographs
Rationale: Images do not naturally conform to a fixed tabular schema.
13. [Data Types and Sources] Which is semi-structured data?
A. JSON documents containing named fields
B. A printed report
C. A spreadsheet with fixed columns only
D. A numeric array with no metadata
Correct Answer: A. JSON documents containing named fields
Rationale: JSON uses tags or key-value structures while allowing flexible schemas.
14. [Data Types and Sources] What is a primary advantage of collecting first-party data?
A. It is always free
B. It never requires cleaning
C. It is always unbiased
D. It is collected directly by the organization from its own interactions
Correct Answer: D. It is collected directly by the organization from its own interactions
Rationale: First-party data comes directly from an organization's own customers, systems, or interactions; it still can contain bias
or quality problems.
, 15. [Data Types and Sources] Which source is most likely an internal data source?
A. A public weather API
B. A government census website
C. A company's CRM system
D. A competitor's annual report
Correct Answer: C. A company's CRM system
Rationale: A CRM is maintained within an organization and is therefore an internal source.
16. [Data Types and Sources] Which source is an example of external data?
A. An employee scheduling table
B. A public government dataset
C. An organization's payroll system
D. An internal inventory database
Correct Answer: B. A public government dataset
Rationale: Government datasets are external to the organization using them.
17. [Data Types and Sources] What is metadata?
A. Data that describes other data
B. A type of chart
C. A deleted record
D. A duplicate record
Correct Answer: A. Data that describes other data
Rationale: Metadata provides context such as definitions, formats, ownership, or creation dates.
18. [Data Types and Sources] Why is data provenance important?
A. It documents where data came from and how it was transformed
B. It removes the need for governance
C. It guarantees data is correct
D. It replaces validation
Correct Answer: A. It documents where data came from and how it was transformed
Rationale: Provenance supports traceability by documenting source and transformation history.
19. [Data Types and Sources] A field containing ZIP codes is usually best treated as what kind of data?
A. Continuous numeric
B. Categorical/nominal
C. Ratio-scale measurement
D. Boolean only
Correct Answer: B. Categorical/nominal
Rationale: ZIP codes identify locations; arithmetic operations on their numeric-looking values are generally not meaningful.
