Learn R Programming MCQ Questions with answers and solutions.

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Q. Unlike writing out a table or CSV file, dump() and dput() preserve the . . . . . . . . so that another user doesn't have to specify the all over again.

(A) metadata
(B) backup data
(C) attribute data
(D) normal data

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Q. Which of the following R code creates a connection to 'foo.txt'?

(A) con <- file("foo.txt")
(B) open(con, "r")
(C) opencon(con, "r")
(D) ocon(con, "r")

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Q. R code can be tested using . . . . . . . . package.

(A) Dplyr
(B) Hadley's testthat
(C) SKLearn
(D) KNN

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Q. Point out the correct statement?

(A) POSIX represents a portable operating system interface, primarily for UNIX systems
(B) There are different levels of indication that can be used, ranging from mere notification to fatal error
(C) The default input format for POSIX dates consists of the month, followed by the year and day, separated by slashes or dashes
(D) R don't have any way to indicate to you that something's not right

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Q. . . . . . . . . function can be used to select the random sample of size 'n' from a huge dataset.

(A) Simple()
(B) Sample()
(C) While()
(D) Signal()

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Q. What will be the output of the following R code?
> g <- function(x) {
+ a <- 3
+ x+a+y
+ ## 'y' is a free variable
+ }
> y <- 3
> g(2)

(A) 9
(B) 42
(C) 8
(D) Error

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Q. What will be the output of the following R code snippet?
> g <- function(x) {
+ a <- 3
+ x+a+y
+ ## 'y' is a free variable
+ }
> g(2)

(A) 9
(B) 42
(C) 8
(D) Error

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Q. What will be the output of the following R code?
> mean(x)
Error in mean(x) : object 'x' not found
> traceback()

(A) 1: mean(x)
(B) Null
(C) 0
(D) 2

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Q. Point out the correct statement?

(A) The search list can be found by using the searchlist() function
(B) The search list can be found by using the search() function
(C) The global environment or the user's workspace is always the second element of the search list
(D) R has separate namespaces for functions and non-functions

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Q. Point out the wrong statement?

(A) Statements cannot be grouped together using braces '{' and '}'
(B) Computation in R consists of sequentially evaluating statements
(C) Single statements are evaluated when a new line is typed at the end of the syntactically complete statement
(D) next is used to skip an iteration of a loop

R Programming MCQs with answers Page - 118

Q. Unlike writing out a table or CSV file, dump() and dput() preserve the . . . . . . . . so that another user doesn't have to specify the all over again.

Q. Which of the following R code creates a connection to 'foo.txt'?

Q. R code can be tested using . . . . . . . . package.

Q. Point out the correct statement?

Q. . . . . . . . . function can be used to select the random sample of size 'n' from a huge dataset.

Q. What will be the output of the following R code?
> g <- function(x) {
+ a <- 3
+ x+a+y
+ ## 'y' is a free variable
+ }
> y <- 3
> g(2)

Q. What will be the output of the following R code snippet?
> g <- function(x) {
+ a <- 3
+ x+a+y
+ ## 'y' is a free variable
+ }
> g(2)

Q. What will be the output of the following R code?
> mean(x)
Error in mean(x) : object 'x' not found
> traceback()

Q. Point out the correct statement?

Q. Point out the wrong statement?

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R Programming MCQs with answers Page - 118

Q. Unlike writing out a table or CSV file, dump() and dput() preserve the . . . . . . . . so that another user doesn't have to specify the all over again.

Q. Which of the following R code creates a connection to 'foo.txt'?

Q. R code can be tested using . . . . . . . . package.

Q. Point out the correct statement?

Q. . . . . . . . . function can be used to select the random sample of size 'n' from a huge dataset.

Q. What will be the output of the following R code? > g <- function(x) { + a <- 3 + x+a+y + ## 'y' is a free variable + } > y <- 3 > g(2)

Q. What will be the output of the following R code snippet? > g <- function(x) { + a <- 3 + x+a+y + ## 'y' is a free variable + } > g(2)

Q. What will be the output of the following R code? > mean(x) Error in mean(x) : object 'x' not found > traceback()

Q. Point out the correct statement?

Q. Point out the wrong statement?

Add MCQ in this Category

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Q. What will be the output of the following R code?
> g <- function(x) {
+ a <- 3
+ x+a+y
+ ## 'y' is a free variable
+ }
> y <- 3
> g(2)

Q. What will be the output of the following R code snippet?
> g <- function(x) {
+ a <- 3
+ x+a+y
+ ## 'y' is a free variable
+ }
> g(2)

Q. What will be the output of the following R code?
> mean(x)
Error in mean(x) : object 'x' not found
> traceback()