WGU D772 Statistical Data Literacy Objective Assessment | OA V1 and V2 | Questions and Answers |
2026 Update | 100% Correct.
Section 1: Data Collection & Study Design
1. The entire group being studied in research is called the:
A. Sample
B. Population
C. Variable
D. Statistic
Answer: B
2. A study where participants are randomly assigned to treatment groups is:
A. Observational
B. Survey
C. Experiment
D. Case study
Answer: C
3. A study where researchers only observe without assigning treatments is:
A. Experimental
B. Observational
C. Double-blind
D. Stratified
Answer: B
4. Selecting departments randomly and surveying all employees in those departments is:
A. Stratified sampling
B. Simple random sampling
C. Cluster sampling
D. Systematic sampling
Answer: C
5. Selecting every 50th person from a list is:
A. Systematic sampling
B. Stratified sampling
C. Cluster sampling
,D. Voluntary sampling
Answer: A
6. Randomly selecting individuals from the entire population is:
A. Convenience sampling
B. Simple random sampling
C. Voluntary sampling
D. Cluster sampling
Answer: B
7. Dividing a population into groups and sampling proportionally is:
A. Cluster
B. Systematic
C. Stratified
D. Voluntary
Answer: C
8. In a double-blind experiment:
A. Only participants are unaware
B. Only researchers are unaware
C. Both participants and researchers are unaware
D. Everyone knows group assignments
Answer: C
9. The group receiving no treatment is the:
A. Experimental group
B. Treatment group
C. Control group
D. Sample group
Answer: C
10. Randomly placing names into a jar to assign exam times demonstrates:
A. Blinding
B. Randomization
C. Replication
,D. Control
Answer: B
🔹 Section 2: Recognizing Bias
11. When participants choose whether to respond to a survey, this creates:
A. Measurement bias
B. Voluntary response bias
C. Stratified bias
D. Experimental bias
Answer: B
12. When many selected individuals fail to respond to a survey:
A. Selection bias
B. Nonresponse bias
C. Self-interest bias
D. Sampling frame error
Answer: B
13. Asking, “Do you support reducing harmful pollution?” is an example of:
A. Neutral question
B. Loaded question
C. Random sampling
D. Blinding
Answer: B
14. A company funding its own product study may involve:
A. Sampling bias
B. Voluntary bias
C. Self-interest bias
D. Nonresponse bias
Answer: C
15. Surveying only people at a gaming convention when studying all adults is:
A. Representative sampling
B. Selection bias
, C. Blinding
D. Randomization
Answer: B
16. Asking people about drunk driving behavior may lead to:
A. Sampling bias
B. Response bias
C. Cluster bias
D. Experimental bias
Answer: B
🔹 Section 3: Association vs Causation
17. Observational studies can show:
A. Causation
B. Association
C. Proof
D. Randomization
Answer: B
18. Only which type of study can prove causation?
A. Survey
B. Observational study
C. Experiment with random assignment
D. Correlation study
Answer: C
19. A hidden variable affecting both variables in a study is called:
A. Treatment variable
B. Confounding variable
C. Control variable
D. Response variable
Answer: B
20. Correlation does NOT imply:
A. Association
2026 Update | 100% Correct.
Section 1: Data Collection & Study Design
1. The entire group being studied in research is called the:
A. Sample
B. Population
C. Variable
D. Statistic
Answer: B
2. A study where participants are randomly assigned to treatment groups is:
A. Observational
B. Survey
C. Experiment
D. Case study
Answer: C
3. A study where researchers only observe without assigning treatments is:
A. Experimental
B. Observational
C. Double-blind
D. Stratified
Answer: B
4. Selecting departments randomly and surveying all employees in those departments is:
A. Stratified sampling
B. Simple random sampling
C. Cluster sampling
D. Systematic sampling
Answer: C
5. Selecting every 50th person from a list is:
A. Systematic sampling
B. Stratified sampling
C. Cluster sampling
,D. Voluntary sampling
Answer: A
6. Randomly selecting individuals from the entire population is:
A. Convenience sampling
B. Simple random sampling
C. Voluntary sampling
D. Cluster sampling
Answer: B
7. Dividing a population into groups and sampling proportionally is:
A. Cluster
B. Systematic
C. Stratified
D. Voluntary
Answer: C
8. In a double-blind experiment:
A. Only participants are unaware
B. Only researchers are unaware
C. Both participants and researchers are unaware
D. Everyone knows group assignments
Answer: C
9. The group receiving no treatment is the:
A. Experimental group
B. Treatment group
C. Control group
D. Sample group
Answer: C
10. Randomly placing names into a jar to assign exam times demonstrates:
A. Blinding
B. Randomization
C. Replication
,D. Control
Answer: B
🔹 Section 2: Recognizing Bias
11. When participants choose whether to respond to a survey, this creates:
A. Measurement bias
B. Voluntary response bias
C. Stratified bias
D. Experimental bias
Answer: B
12. When many selected individuals fail to respond to a survey:
A. Selection bias
B. Nonresponse bias
C. Self-interest bias
D. Sampling frame error
Answer: B
13. Asking, “Do you support reducing harmful pollution?” is an example of:
A. Neutral question
B. Loaded question
C. Random sampling
D. Blinding
Answer: B
14. A company funding its own product study may involve:
A. Sampling bias
B. Voluntary bias
C. Self-interest bias
D. Nonresponse bias
Answer: C
15. Surveying only people at a gaming convention when studying all adults is:
A. Representative sampling
B. Selection bias
, C. Blinding
D. Randomization
Answer: B
16. Asking people about drunk driving behavior may lead to:
A. Sampling bias
B. Response bias
C. Cluster bias
D. Experimental bias
Answer: B
🔹 Section 3: Association vs Causation
17. Observational studies can show:
A. Causation
B. Association
C. Proof
D. Randomization
Answer: B
18. Only which type of study can prove causation?
A. Survey
B. Observational study
C. Experiment with random assignment
D. Correlation study
Answer: C
19. A hidden variable affecting both variables in a study is called:
A. Treatment variable
B. Confounding variable
C. Control variable
D. Response variable
Answer: B
20. Correlation does NOT imply:
A. Association
