Control Structures in R Programming MCQ question and answer with solution

21

What will be the output of the following R code snippet?

> paste("a", "b", se = ":")

A) "a+b" B) "a=b" C) "a b :" D) none of the mentioned

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Answer & Solution

Answer: Option D

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22

CRAN package ecosystem has more than . . . . . . . . packages.

A) 5000 B) 4000 C) 6000 D) 8000

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Answer & Solution

Answer: Option C

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23

. . . . . . . . function will measure the probability of the binary response variable in R language.

A) Glm() B) Glmi() C) Gelmi() D) Jlm()

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Answer & Solution

Answer: Option A

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24

Point out the correct statement?

A) Writing functions is a core activity of an R programmer B) Functions are often used to encapsulate a sequence of expressions that need to be executed numerous times C) Functions are also often written when code must be shared with others or the public D) All of the mentioned

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Answer & Solution

Answer: Option D

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25

How missing values and impossible values are represented in R language?

A) NA B) NAN C) NA & NAN D) Not Exist

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Answer & Solution

Answer: Option C

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26

What will be the output of the following R code?

> x <- list(a = 1:4, b = rnorm(10), c = rnorm(20, 1), d = rnorm(100, 5))
> lapply(x, mean)

A)

$a
[1] 2.5
$b
[1] 1.248845
$c
[1] 1.9935285
Loop Functions 90
$d
[1] 5.051388

B)

$a
[1] 2.5
$b
[1] 0.248845
$c
[1] 0.9935285
Loop Functions 90
$d
[1] 5.051388

C)

$a
[1] 3.5
$b
[1] 0.248845
$c
[1] 0.9935285
Loop Functions 90
$d
[1] 5.051388

D) Error

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Answer & Solution

Answer: Option B

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27

The . . . . . . . . function takes a vector or other objects and splits it into groups determined by a factor or list of factors.

A) apply() B) lsplit() C) split() D) mapply()

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Answer & Solution

Answer: Option C

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28

The . . . . . . . . function is used to plot negative likelihood.

A) plot() B) graph() C) graph.plot() D) plot.graph()

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Answer & Solution

Answer: Option A

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29

lappy functions takes . . . . . . . . arguments in R language.

A) two B) three C) four D) five

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Answer & Solution

Answer: Option C

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30

Which function is more verbose?

A) Lapply B) Japply C) Vapply D) Zapply

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Answer & Solution

Answer: Option C

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Control Structures in R Programming MCQ question and answer with solution | R Programming MCQs