Practice Library
All MCQs
Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
Choose an option to check your answer.
A.
Examining how income changes with years of education
B.
Summarizing the ages in one column
C.
Counting missing values in the entire file
D.
Listing the names of all variables
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Correct Answer: A. Examining how income changes with years of education
Explanation:
Bivariate analysis investigates the relationship between two variables.
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A.
Does one variable cause another?
B.
Which cluster label is correct?
C.
What is the optimal database index?
D.
How is one variable distributed?
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Correct Answer: D. How is one variable distributed?
Explanation:
Univariate analysis focuses on the behavior of a single variable.
Choose an option to check your answer.
A.
The sample size becomes smaller
B.
The variables become categorical
C.
The visual clutter reduces the data-to-ink efficiency
D.
The data loses precision in storage
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Correct Answer: C. The visual clutter reduces the data-to-ink efficiency
Explanation:
Nonessential visual elements compete with the data for attention.
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A.
Data normalization
B.
Graphical integrity
C.
Random sampling
D.
Feature scaling
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Correct Answer: B. Graphical integrity
Explanation:
Graphical integrity requires visual proportions to represent numerical proportions honestly.
Choose an option to check your answer.
A.
It helps determine whether observed patterns are meaningful or plausible
B.
It automatically removes sampling bias
C.
It guarantees a normal distribution
D.
It replaces the need for labels
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Correct Answer: A. It helps determine whether observed patterns are meaningful or plausible
Explanation:
Patterns can have different meanings in different subject areas.
Choose an option to check your answer.
A.
Confirmatory analysis uses no statistics
B.
EDA requires randomized experiments
C.
EDA can only use qualitative data
D.
Confirmatory analysis tests pre-specified hypotheses, while EDA searches for patterns
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Correct Answer: D. Confirmatory analysis tests pre-specified hypotheses, while EDA searches for patterns
Explanation:
Confirmatory analysis evaluates questions defined before examining the evidence.
Choose an option to check your answer.
A.
Displaying every available variable
B.
Using as many colors as possible
C.
Communicating a clear data-driven message
D.
Maximizing decorative elements
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Correct Answer: C. Communicating a clear data-driven message
Explanation:
A chart should make the intended comparison or pattern easy to understand.
Choose an option to check your answer.
A.
Fit the most complex model available
B.
Inspect the variables, data types, and data quality
C.
Publish a dashboard
D.
Remove all unusual observations
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Correct Answer: B. Inspect the variables, data types, and data quality
Explanation:
Initial inspection reveals the structure and limitations of the dataset.
Choose an option to check your answer.
A.
To discover patterns, anomalies, and structure before formal modeling
B.
To prove a predetermined hypothesis
C.
To replace data collection
D.
To guarantee causal conclusions
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Correct Answer: A. To discover patterns, anomalies, and structure before formal modeling
Explanation:
EDA helps analysts understand what the data contains before choosing a model.
Choose an option to check your answer.
A.
List every possible visualization without priorities
B.
Commit to one large release with no feedback
C.
Focus only on purchasing licenses
D.
Sequence capabilities and projects according to business value, dependencies, governance, and resources
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Correct Answer: D. Sequence capabilities and projects according to business value, dependencies, governance, and resources
Explanation:
A roadmap connects BI investments to strategic outcomes and practical delivery constraints.
Choose an option to check your answer.
A.
They eliminate all security responsibilities
B.
They guarantee zero data-transfer cost
C.
Elastic resources and managed services can accelerate scaling and deployment
D.
They make data modeling unnecessary
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Correct Answer: C. Elastic resources and managed services can accelerate scaling and deployment
Explanation:
Cloud platforms can provision capacity quickly and offer managed integration and analytics.
Choose an option to check your answer.
A.
The color standard for executive charts
B.
Measurable expectations such as availability, refresh completion, and response time
C.
The natural key of every dimension
D.
The formula for each source-system transaction
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Correct Answer: B. Measurable expectations such as availability, refresh completion, and response time
Explanation:
An SLA converts service expectations into measurable commitments.
