Intro to R Day 1 Quiz

What is a correct syntax to output "Hello World" in R?

• 'Hello World'

• "Hello World"

• print("Hello World")

• All of the answers are correct.

How do you insert COMMENTS in R code?

• # This is a comment

• // This is a comment

• /* This is a comment

How do you create a variable named x with the numeric value 5?

• x <- 5

• x == 5

• int x = 5

• x : 5

What is the correct way to create a vector of strings?

• fruits <- v("banana", "apple", "orange")

• fruits <- listOf("banana", "apple", "orange")

• fruits <- c("banana", "apple", "orange")

• fruits <- list("banana", "apple", "orange")

What is the correct way to create a list of strings?

• fruits <- vectorOf("banana", "apple", "orange")

• fruits <- v("banana", "apple", "orange")

• fruits <- list("banana", "apple", "orange")

• fruits <- c("banana", "apple", "orange")

Which function is used to add additional columns in a matrix?

• add()

• join()

• append_item()

• cbind()

Which function is used to find the amount of rows and columns in an matrix/array?

• length()

• dim_len()

• dim()

• nchar()

Which of the following method make a vector of repeated values?

• rep()

• data()

• View()

• none of the above

What would be the output of the following code?

x <- 1:4

x > 2

• FALSE FALSE TRUE TRUE

• 1 2 3 4

• 1 2 3 4 5

• none of the above

Which of the following is an example of vectorized operation as far as subtraction is concerned?
x <- 1:4

y <- 6:9

• x+y

• x-y

• x*y

• x/y