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All MCQs
Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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.
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 single box plot
B.
A Q-Q plot
C.
A stacked bar chart
D.
A correlogram
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Correct Answer: C. A stacked bar chart
Explanation:
Stacked bars display both total magnitude and categorical composition.
Choose an option to check your answer.
A.
Two category counts only
B.
Observed quantiles with quantiles from a reference distribution
C.
Means with standard deviations
D.
Time values with survival probabilities
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Correct Answer: B. Observed quantiles with quantiles from a reference distribution
Explanation:
If the observed data follow the reference distribution, points lie near a straight line.
Choose an option to check your answer.
A.
Overlaid or faceted ECDF plots
B.
Multiple three-dimensional pie charts
C.
A single stacked bar with no labels
D.
A network force layout
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Correct Answer: A. Overlaid or faceted ECDF plots
Explanation:
ECDFs preserve all observed values and support percentile comparison.
Choose an option to check your answer.
A.
A grouped bar chart
B.
A dendrogram
C.
A lag plot
D.
An empirical cumulative distribution function plot
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Correct Answer: D. An empirical cumulative distribution function plot
Explanation:
An ECDF maps each value to the proportion of observations no greater than it.
Choose an option to check your answer.
A.
To sort the x-axis alphabetically
B.
To calculate covariance
C.
To make regions with many overlapping points appear darker
D.
To remove missing values
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Correct Answer: C. To make regions with many overlapping points appear darker
Explanation:
Semi-transparent points accumulate opacity where observations overlap.
Choose an option to check your answer.
A.
Truncating all values
B.
Jittering
C.
Removing the axes
D.
Converting every point to a line
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Correct Answer: B. Jittering
Explanation:
Jittering adds a small amount of visual displacement to coincident points.
Choose an option to check your answer.
A.
Many observations occupy the same or nearby pixel positions
B.
The axes are labeled twice
C.
The regression line is too short
D.
The plot contains too few points
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Correct Answer: A. Many observations occupy the same or nearby pixel positions
Explanation:
Dense or duplicated points can hide the true number of observations.
Choose an option to check your answer.
A.
A single-variable histogram
B.
A pie chart
C.
A one-column frequency table only
D.
A scatter plot
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Correct Answer: D. A scatter plot
Explanation:
Each point in a scatter plot represents a paired observation.
Choose an option to check your answer.
A.
It removes the category labels
B.
It forces all values to be equal
C.
The line implies continuity and meaningful transitions between categories
D.
It prevents the use of color
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Correct Answer: C. The line implies continuity and meaningful transitions between categories
Explanation:
A line suggests that intermediate positions and sequential movement have meaning.
Choose an option to check your answer.
A.
When categories have no natural order
B.
When observations are ordered, especially across time
C.
When displaying one static nominal count
D.
When showing a single median only
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Correct Answer: B. When observations are ordered, especially across time
Explanation:
Lines emphasize continuity and changes along an ordered axis.
