MCQ Collection
Data Visualization MCQs
Practice Data Visualization questions with answers and explanations.
Choose an option to check your answer.
A.
The categorical ordering of labels
B.
The sign of the sample mean
C.
The number of missing columns
D.
Tail heaviness and the frequency of extreme observations
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Correct Answer: D. Tail heaviness and the frequency of extreme observations
Explanation:
Kurtosis reflects how much probability lies in the tails relative to a reference.
Choose an option to check your answer.
A.
The sample mean changes with bar width
B.
All bins become categorical
C.
Unequal widths force negative frequencies
D.
Wider bins may contain more observations simply because they cover more range
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Correct Answer: D. Wider bins may contain more observations simply because they cover more range
Explanation:
With unequal widths, bar area rather than height should represent frequency.
Choose an option to check your answer.
A.
The 25th percentile
B.
The 75th percentile
C.
The 100th percentile
D.
The 50th percentile
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Correct Answer: D. The 50th percentile
Explanation:
The median divides ordered data into lower and upper halves.
Choose an option to check your answer.
A.
A constant horizontal mass at discrete points
B.
A strictly decreasing step function
C.
A two-peak curve in every case
D.
A symmetric bell-shaped curve
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Correct Answer: D. A symmetric bell-shaped curve
Explanation:
The normal density is symmetric around its mean and has one central peak.
Choose an option to check your answer.
A.
A mean computed after removing a specified proportion from both tails
B.
A median with duplicated values removed
C.
A range divided by sample size
D.
A mean calculated only for missing values
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Correct Answer: A. A mean computed after removing a specified proportion from both tails
Explanation:
Trimming reduces the influence of the most extreme observations.
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.
It may be a valid rare observation or evidence of a data problem
B.
All outliers are measurement errors
C.
Removing it always improves prediction
D.
Outliers cannot affect summaries
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Correct Answer: A. It may be a valid rare observation or evidence of a data problem
Explanation:
An unusual point can arise from error, novelty, or genuine variation.
Choose an option to check your answer.
A.
The interquartile range
B.
The range
C.
The variance
D.
The standard deviation
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Correct Answer: A. The interquartile range
Explanation:
The IQR depends only on Q1 and Q3, not the most extreme value.
Choose an option to check your answer.
A.
A percentile that divides ordered data into four parts
B.
A mean computed from four observations
C.
A graph with four panels
D.
A probability that must equal 0.25
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Correct Answer: A. A percentile that divides ordered data into four parts
Explanation:
The first, second, and third quartiles correspond approximately to the 25th, 50th, and 75th percentiles.
Choose an option to check your answer.
A.
They are equal
B.
The mean is always largest
C.
The median is always smallest
D.
The mode is undefined
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Correct Answer: A. They are equal
Explanation:
Symmetry and unimodality place all three measures at the center.
Choose an option to check your answer.
A.
Their sample means
B.
Their dispersion around the mean
C.
Their measurement units
D.
Their number of variables
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Correct Answer: B. Their dispersion around the mean
Explanation:
Standard deviation measures spread, not center.
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.
