MCQ Collection
Data Visualization MCQs
Practice Data Visualization questions with answers and explanations.
Choose an option to check your answer.
A.
Nonnegative real values
B.
All negative real values only
C.
Integers from 1 to 6
D.
Values strictly between -1 and 1
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Correct Answer: A. Nonnegative real values
Explanation:
Waiting times cannot be negative, so the exponential distribution begins at zero.
Choose an option to check your answer.
A.
(mean - x) × standard deviation
B.
(x - mean) / standard deviation
C.
x / variance squared
D.
(x + median) / range
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Correct Answer: B. (x - mean) / standard deviation
Explanation:
Subtracting the mean centers the observation, and dividing by the standard deviation scales it.
Choose an option to check your answer.
A.
It changes the raw data values
B.
It changes the level of detail visible in the distribution
C.
It changes the sample size
D.
It converts continuous data to nominal data permanently
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Correct Answer: B. It changes the level of detail visible in the distribution
Explanation:
Very wide bins can hide modes and gaps, while very narrow bins can emphasize noise.
Choose an option to check your answer.
A.
A single ordered list only
B.
Values in a two-dimensional matrix or grid
C.
Exact text definitions
D.
A probability model's formula
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Correct Answer: B. Values in a two-dimensional matrix or grid
Explanation:
Heat maps map matrix cells to colors representing magnitude.
Choose an option to check your answer.
A.
The variance is multiplied by 3
B.
The variance is multiplied by 9
C.
The variance is unchanged
D.
The variance becomes zero
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Correct Answer: B. The variance is multiplied by 9
Explanation:
Variance scales with the square of the multiplicative constant.
Choose an option to check your answer.
A.
A probability density for a continuous interval
B.
The probability of that discrete outcome
C.
A regression coefficient
D.
A cluster label
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Correct Answer: B. The probability of that discrete outcome
Explanation:
A PMF describes a discrete random variable by listing outcome probabilities.
Choose an option to check your answer.
A.
A value chosen manually without rules
B.
A deterministic sequence designed to behave like random draws
C.
A number that can never be reproduced
D.
A missing numeric observation
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Correct Answer: B. A deterministic sequence designed to behave like random draws
Explanation:
Computer generators use algorithms and an internal state to produce random-like sequences.
Choose an option to check your answer.
A.
Every event occurs at the same fixed time
B.
Remaining waiting time does not depend on how long one has already waited
C.
Past observations determine future values exactly
D.
Its mean always equals zero
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Correct Answer: B. Remaining waiting time does not depend on how long one has already waited
Explanation:
Conditional on survival to the present, the future waiting distribution is unchanged.
Choose an option to check your answer.
A.
The mean in every implementation
B.
The sample size
C.
The median
D.
The maximum
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Correct Answer: C. The median
Explanation:
The box extends from the first to the third quartile.
Choose an option to check your answer.
A.
A histogram with touching bins
B.
A survival curve
C.
A bar chart
D.
A kernel density curve only
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Correct Answer: C. A bar chart
Explanation:
Bar charts encode category counts or values with separated bars.
Choose an option to check your answer.
A.
A single-variable box plot
B.
A pie chart with one slice
C.
A heat map
D.
A stem-and-leaf plot only
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Correct Answer: C. A heat map
Explanation:
The rows and columns can represent the two categorical dimensions.
Choose an option to check your answer.
A.
It increases by that constant
B.
It becomes the constant
C.
It remains unchanged
D.
It is squared
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Correct Answer: C. It remains unchanged
Explanation:
Adding a constant shifts the entire distribution without changing relative distances.
