MCQ Collection
Data Visualization MCQs
Practice Data Visualization questions with answers and explanations.
Choose an option to check your answer.
A.
Missing values always equal zero
B.
Charts cannot contain numeric values
C.
Missingness guarantees independence
D.
Missingness can distort summaries and may itself contain information
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Correct Answer: D. Missingness can distort summaries and may itself contain information
Explanation:
Ignoring missing values can change the apparent distribution or relationship.
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A.
The first three elements of x
B.
All elements except the third
C.
The length of x
D.
The third element of x
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Correct Answer: D. The third element of x
Explanation:
Square brackets select elements by position or condition.
Choose an option to check your answer.
A.
rbind()
B.
append_rows()
C.
factor()
D.
cbind()
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Correct Answer: D. cbind()
Explanation:
cbind() binds objects by column and therefore adds variables horizontally.
Choose an option to check your answer.
A.
A mapping from data values to properties such as position, length, or color
B.
A method for encrypting a dataset
C.
A formula for generating random numbers
D.
A rule for naming variables
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Correct Answer: A. A mapping from data values to properties such as position, length, or color
Explanation:
Visual encoding translates abstract values into perceivable graphical features.
Choose an option to check your answer.
A.
str()
B.
plot()
C.
rm()
D.
setwd()
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Correct Answer: A. str()
Explanation:
The str() function gives a compact description of an object's components and types.
Choose an option to check your answer.
A.
A container that can hold elements of different types and structures
B.
A vector restricted to logical values
C.
A matrix with one column
D.
A function that sorts rows
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Correct Answer: A. A container that can hold elements of different types and structures
Explanation:
Lists can contain vectors, data frames, functions, or even other lists.
Choose an option to check your answer.
A.
Area of irregular shapes
B.
Position along a common scale
C.
Color hue
D.
Three-dimensional volume
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Correct Answer: B. Position along a common scale
Explanation:
People compare aligned positions more accurately than areas, hues, or volumes.
Choose an option to check your answer.
A.
A 3-by-3 matrix
B.
A numeric vector containing 2, 4, and 6
C.
A logical comparison
D.
A character factor
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Correct Answer: B. A numeric vector containing 2, 4, and 6
Explanation:
The c() function combines its arguments into a vector.
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A.
NULL only
B.
NA
C.
Inf only
D.
NaN only
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Correct Answer: B. NA
Explanation:
NA is the standard marker for a missing value in R.
Choose an option to check your answer.
A.
The audience determines the sample mean
B.
The audience changes the raw observations
C.
The level of detail and terminology should match viewers' needs and knowledge
D.
The audience eliminates uncertainty
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Correct Answer: C. The level of detail and terminology should match viewers' needs and knowledge
Explanation:
A technical audience may need detail that would overwhelm a general audience.
Choose an option to check your answer.
A.
==
B.
%in%
C.
<-
D.
:
Show Answer
Correct Answer: C. <-
Explanation:
The assignment operator stores the value on the right in the name on the left.
Choose an option to check your answer.
A.
It forces all generated values to equal 123
B.
It changes numeric values to factors
C.
It makes the random sequence reproducible
D.
It removes sampling variation
Show Answer
Correct Answer: C. It makes the random sequence reproducible
Explanation:
A seed initializes the pseudo-random number generator to a known state.
