MCQ Collection
Data Visualization MCQs
Practice Data Visualization questions with answers and explanations.
Choose an option to check your answer.
A.
A pie chart
B.
A network diagram
C.
A stacked area chart
D.
A histogram
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Correct Answer: D. A histogram
Explanation:
A histogram groups continuous values into intervals and displays their frequencies.
Choose an option to check your answer.
A.
They cannot display totals
B.
They require continuous categories
C.
They always use logarithmic axes
D.
Most segments lack a common baseline
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Correct Answer: D. Most segments lack a common baseline
Explanation:
Only the first segment typically starts from the same baseline across bars.
Choose an option to check your answer.
A.
A row containing only one variable
B.
A category with the highest frequency
C.
A point outside a histogram bin
D.
An observation with an unusual combination of variable values
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Correct Answer: D. An observation with an unusual combination of variable values
Explanation:
Each individual value may appear ordinary while the joint combination is rare.
Choose an option to check your answer.
A.
Delete it to improve appearance
B.
Replace it with the mean without disclosure
C.
Hide the corresponding axis region
D.
Retain it and use methods or displays that represent its influence honestly
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Correct Answer: D. Retain it and use methods or displays that represent its influence honestly
Explanation:
Valid observations should not be removed merely because they are inconvenient.
Choose an option to check your answer.
A.
It hides exact observations
B.
It cannot compare groups
C.
It always appears smooth
D.
It avoids arbitrary bin boundaries
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Correct Answer: D. It avoids arbitrary bin boundaries
Explanation:
An ECDF uses every observed value directly.
Choose an option to check your answer.
A.
A symmetric measurement error around zero
B.
The number of categories in a survey
C.
A variable bounded equally around its mean
D.
Waiting time until the next event in a constant-rate process
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Correct Answer: D. Waiting time until the next event in a constant-rate process
Explanation:
The exponential model describes positive waiting times between Poisson-process events.
Choose an option to check your answer.
A.
The observation is above the mean
B.
The observation is below the minimum
C.
The observation equals the median
D.
The standard deviation is negative
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Correct Answer: A. The observation is above the mean
Explanation:
A z-score expresses distance from the mean in standard-deviation units.
Choose an option to check your answer.
A.
The number of observations in the corresponding bin
B.
The alphabetical order of values
C.
The sample mean only
D.
The width of the plot window
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Correct Answer: A. The number of observations in the corresponding bin
Explanation:
A frequency histogram counts observations within each interval.
Choose an option to check your answer.
A.
A grouped bar chart or dot plot
B.
A three-dimensional stacked area chart
C.
A decorative pictogram
D.
A single pie chart
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Correct Answer: A. A grouped bar chart or dot plot
Explanation:
Grouped bars and dots align comparable values to a shared scale.
Choose an option to check your answer.
A.
Deviations from the mean are squared
B.
It uses only the median
C.
It ignores numerical magnitude
D.
It counts categories alphabetically
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Correct Answer: A. Deviations from the mean are squared
Explanation:
Squaring gives large deviations disproportionately high influence.
Choose an option to check your answer.
A.
Both detailed shape and a robust compact summary
B.
Two identical representations
C.
Proof of normality
D.
A direct causal analysis
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Correct Answer: A. Both detailed shape and a robust compact summary
Explanation:
The histogram shows modality and shape, while the box plot highlights quartiles and outliers.
Choose an option to check your answer.
A.
An ECDF
B.
A dendrogram
C.
A grouped bar chart of unrelated categories
D.
A network graph
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Correct Answer: A. An ECDF
Explanation:
At x = 20, the ECDF's vertical value is the observed cumulative proportion.
