MCQ Collection
Data Visualization MCQs
Practice Data Visualization questions with answers and explanations.
Choose an option to check your answer.
A.
The event occurred before observation began
B.
The event has not occurred by the last observed time
C.
The event time is known exactly
D.
The event can occur only on the right side of a graph
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Correct Answer: B. The event has not occurred by the last observed time
Explanation:
Right-censored observations provide a lower bound on event time.
Choose an option to check your answer.
A.
Keep default variable codes without explanation
B.
Use informative titles, axis labels, units, and legends
C.
Remove every tick mark regardless of context
D.
Use unrelated colors for identical meanings
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Correct Answer: B. Use informative titles, axis labels, units, and legends
Explanation:
Labels tell viewers what variables and scales represent.
Choose an option to check your answer.
A.
A normal probability density
B.
A k-means centroid
C.
The survival function over time
D.
The covariance matrix
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Correct Answer: C. The survival function over time
Explanation:
Kaplan-Meier uses observed events and risk sets to estimate survival probabilities.
Choose an option to check your answer.
A.
save_mean()
B.
write_plot_data()
C.
ggsave()
D.
export_factor()
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Correct Answer: C. ggsave()
Explanation:
ggsave() saves the current or specified ggplot object in formats such as PNG, PDF, or SVG.
Choose an option to check your answer.
A.
It never lasts more than one period
B.
It contains no rises or falls
C.
It must repeat every seven days
D.
Its duration and timing are not fixed to a regular calendar period
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Correct Answer: D. Its duration and timing are not fixed to a regular calendar period
Explanation:
Cycles involve broad expansions and contractions with variable lengths.
Choose an option to check your answer.
A.
The probability of an event exactly at time zero
B.
The mean number of clusters
C.
The cumulative probability below a numeric predictor
D.
The probability of surviving beyond time t
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Correct Answer: D. The probability of surviving beyond time t
Explanation:
S(t) equals the probability that event time T is greater than t.
Choose an option to check your answer.
A.
It guarantees every hypothesis is correct
B.
It removes the need for source data
C.
It converts all graphs into three dimensions
D.
Code, results, narrative, and graphics can be regenerated together
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Correct Answer: D. Code, results, narrative, and graphics can be regenerated together
Explanation:
Literate documents link explanations directly to executable analysis code.
Choose an option to check your answer.
A.
A constant mean and variance with autocovariance depending only on lag
B.
A series with no observations
C.
A perfectly flat line
D.
A mean that grows every period
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Correct Answer: A. A constant mean and variance with autocovariance depending only on lag
Explanation:
Weak stationarity keeps first and second moments stable over time.
Choose an option to check your answer.
A.
The instantaneous event rate among subjects still at risk
B.
The cumulative proportion surviving
C.
The sample variance of time
D.
The number of censored subjects only
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Correct Answer: A. The instantaneous event rate among subjects still at risk
Explanation:
Hazard concerns the immediate rate of event occurrence conditional on survival so far.
Choose an option to check your answer.
A.
A bullet chart or compact bar with a clearly marked target
B.
A three-dimensional pie chart
C.
An unlabeled icon array
D.
A rotating animation
Show Answer
Correct Answer: A. A bullet chart or compact bar with a clearly marked target
Explanation:
Aligned positions and lengths enable accurate comparison with a target.
Choose an option to check your answer.
A.
Correlation between category labels
B.
Correlation between a series and lagged versions of itself
C.
The average of all observations
D.
A probability density estimate
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Correct Answer: B. Correlation between a series and lagged versions of itself
Explanation:
Autocorrelation measures temporal dependence at a chosen lag.
Choose an option to check your answer.
A.
The highest observed event time
B.
The time at which estimated survival reaches 0.5
C.
The average censoring time
D.
The first time survival reaches 1
Show Answer
Correct Answer: B. The time at which estimated survival reaches 0.5
Explanation:
Median survival divides the estimated survival distribution in half.
