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Question 120
A forecast model accidentally includes the actual final sales figure among its input fields. What issue invalidates the reported performance?
- Feature vector
- Labeled examples
- Training target leakage
- Ground-truth annotation review
Explanation
Correct Answer
C:The answer was effectively revealed to the model during training or testing. Target leakage occurs when a model receives information unavailable or improper at prediction time.
Incorrect Answers
A:A feature vector represents input characteristics rather than the desired target label. This does not directly meet the case requirement to remove information that leaks the target.
B:Labeled data includes known target annotations such as sentiment or category used during supervised learning. This does not directly meet the case requirement to remove information that leaks the target.
D:Annotation review checks whether human or system labels are accurate and consistent. This does not directly meet the case requirement to remove information that leaks the target.
Question 121
A customer support dataset omits resolution details in half its rows. Which data-quality issue is most direct?
- Accuracy
- Completeness
- Relevance
- Consistency
Explanation
Correct Answer
B:Required information is absent in many examples. Completeness asks whether necessary fields and records are present.
Incorrect Answers
A:Accuracy asks whether recorded facts reflect the real-world values they claim to represent. This does not directly meet the case requirement to ensure fields needed for learning are present.
C:Relevance asks whether examples and fields correspond to the actual business question. This does not directly meet the case requirement to ensure fields needed for learning are present.
D:Consistency asks whether logically equivalent values use compatible definitions and formats. This does not directly meet the case requirement to ensure fields needed for learning are present.
Question 122
One source represents months as numbers and another as localized names for the same field. What quality dimension is threatened?
- Consistency
- Timeliness
- Relevance
- Accuracy
Explanation
Correct Answer
A:Inconsistent encodings can undermine reliable joins and transformations. Consistency asks whether logically equivalent values use compatible definitions and formats.
Incorrect Answers
B:Timeliness asks whether information is current enough for the decision being made. This does not directly meet the case requirement to standardize equivalent values across sources.
C:Relevance asks whether examples and fields correspond to the actual business question. This does not directly meet the case requirement to standardize equivalent values across sources.
D:Accuracy asks whether recorded facts reflect the real-world values they claim to represent. This does not directly meet the case requirement to standardize equivalent values across sources.
Question 123
Shipping addresses were entered with incorrect postal codes. Which issue is involved?
- Timeliness
- Representativeness
- Consistency
- Accuracy
Explanation
Correct Answer
D:The stored values are factually wrong, not simply missing. Accuracy asks whether recorded facts reflect the real-world values they claim to represent.
Incorrect Answers
A:Timeliness asks whether information is current enough for the decision being made. This does not directly meet the case requirement to correct records that misrepresent actual addresses.
B:Representativeness asks whether data covers the intended populations and important subgroups fairly. This does not directly meet the case requirement to correct records that misrepresent actual addresses.
C:Consistency asks whether logically equivalent values use compatible definitions and formats. This does not directly meet the case requirement to correct records that misrepresent actual addresses.
Question 124
An assistant relies on last year's price list for today's quotes. Which quality dimension fails?
- Representativeness
- Consistency
- Relevance
- Timeliness
Explanation
Correct Answer
D:Price information has become outdated for the requested decision. Timeliness asks whether information is current enough for the decision being made.
Incorrect Answers
A:Representativeness asks whether data covers the intended populations and important subgroups fairly. This does not directly meet the case requirement to use current information rather than stale records.
B:Consistency asks whether logically equivalent values use compatible definitions and formats. This does not directly meet the case requirement to use current information rather than stale records.
C:Relevance asks whether examples and fields correspond to the actual business question. This does not directly meet the case requirement to use current information rather than stale records.
Question 125
A hospital model is trained largely on unrelated consumer reviews rather than relevant clinical data. Which issue dominates?
- Relevance
- Timeliness
- Representativeness
- Completeness
Explanation
Correct Answer
A:The training content does not match the intended task. Relevance asks whether examples and fields correspond to the actual business question.
Incorrect Answers
B:Timeliness asks whether information is current enough for the decision being made. This does not directly meet the case requirement to choose examples pertinent to the problem.
C:Representativeness asks whether data covers the intended populations and important subgroups fairly. This does not directly meet the case requirement to choose examples pertinent to the problem.
D:Completeness asks whether necessary fields and records are present. This does not directly meet the case requirement to choose examples pertinent to the problem.
Question 126
A credit model is trained mostly on one region but used across a diverse national population. Which dimension needs review?
- Accuracy
- Representativeness
- Consistency
- Completeness
Explanation
Correct Answer
B:Missing population coverage can hide subgroup errors. Representativeness asks whether data covers the intended populations and important subgroups fairly.
Incorrect Answers
A:Accuracy asks whether recorded facts reflect the real-world values they claim to represent. This does not directly meet the case requirement to cover the deployment population appropriately.
C:Consistency asks whether logically equivalent values use compatible definitions and formats. This does not directly meet the case requirement to cover the deployment population appropriately.
D:Completeness asks whether necessary fields and records are present. This does not directly meet the case requirement to cover the deployment population appropriately.
Question 127
A dataset lacks incident priority for most records needed by a triage model. What should the steward flag?
- Accuracy
- Completeness
- Representativeness
- Timeliness
Explanation
Correct Answer
B:Necessary attributes are unavailable in the source. Completeness asks whether necessary fields and records are present.
Incorrect Answers
A:Accuracy asks whether recorded facts reflect the real-world values they claim to represent. This does not directly meet the case requirement to address missing required data fields.
C:Representativeness asks whether data covers the intended populations and important subgroups fairly. This does not directly meet the case requirement to address missing required data fields.
D:Timeliness asks whether information is current enough for the decision being made. This does not directly meet the case requirement to address missing required data fields.
Question 128
The same company ID is stored as 00042 in one system and 42 in another without normalization. Which dimension matters?
- Timeliness
- Consistency
- Completeness
- Relevance
Explanation
Correct Answer
B:Different representations for the same entity complicate matching. Consistency asks whether logically equivalent values use compatible definitions and formats.
Incorrect Answers
A:Timeliness asks whether information is current enough for the decision being made. This does not directly meet the case requirement to align formats for equivalent identifiers.
C:Completeness asks whether necessary fields and records are present. This does not directly meet the case requirement to align formats for equivalent identifiers.
D:Relevance asks whether examples and fields correspond to the actual business question. This does not directly meet the case requirement to align formats for equivalent identifiers.
Question 129
An internal knowledge assistant misses an emergency policy update made this morning. Which data quality concern is implicated?
- Relevance
- Accuracy
- Timeliness
- Representativeness
Explanation
Correct Answer
C:Freshness is decisive when policy changes rapidly. Timeliness asks whether information is current enough for the decision being made.
Incorrect Answers
A:Relevance asks whether examples and fields correspond to the actual business question. This does not directly meet the case requirement to answer from sufficiently recent policy evidence.
B:Accuracy asks whether recorded facts reflect the real-world values they claim to represent. This does not directly meet the case requirement to answer from sufficiently recent policy evidence.
D:Representativeness asks whether data covers the intended populations and important subgroups fairly. This does not directly meet the case requirement to answer from sufficiently recent policy evidence.
Question 130
A recruiting dataset contains only applicants from one job family but the model will screen several. Which concern is key?
- Accuracy
- Representativeness
- Timeliness
- Relevance
Explanation
Correct Answer
B:Sampling omissions can produce invalid or unfair performance outside the training group. Representativeness asks whether data covers the intended populations and important subgroups fairly.
Incorrect Answers
A:Accuracy asks whether recorded facts reflect the real-world values they claim to represent. This does not directly meet the case requirement to represent all intended applicant groups.
C:Timeliness asks whether information is current enough for the decision being made. This does not directly meet the case requirement to represent all intended applicant groups.
D:Relevance asks whether examples and fields correspond to the actual business question. This does not directly meet the case requirement to represent all intended applicant groups.
Generative AI Leader Practice Tests