DATA SCIENCE 4

What will be the output of the following R code?

x <- c(1, 2, 3)

y <- c("4", "5", "six")

z <- c(x, y)

z[4:6]

class(z)

• [1] "4" "5" "six"

  [1] "character"

• [1] 4 5 six

  [1] "numeric"

• [1] 4 5 six

  [1] "mixed"

• [1] "1" "2" "3"

  [1] "character"

What will be the output of this code?

x <- c(TRUE, FALSE, TRUE)

y <- c(1, 0, 2)

sum(x * y)

• A. 3
  
  
  

• B. 2

• C. 1

• D. Error

x <- c(1, 2, 3)

y <- c(4, 5, 6)

x + y

• A. 5 7 9

• B. Error

• C. x4 x5 x6

• D. 1 2 3 4 5 6

What does the c() function do in R?

• A. Cuts a string

• B. Creates a matrix

• C. Combines values into a vector

• D. Converts data to character type

What will this code return?

x <- c(10, 20, 30, 40) x[2:3]

• A. 10 20
  
  
  

• B. 20 30

• C. 30 40

• D. 20 30 40

Which function is used to create a data frame?

• A. create.frame()

• B. frame()

• C. data.frame()

• D. make.frame()

What will length(c(2, 4, 6, 8)) return?

• A. 2
  
  
  

• B. 4

• C. 8

• D. Error

What will be the output?

x <- c(TRUE, FALSE, TRUE)

sum(x)

• A. 3
  
  
  

• B. 1

• C. 2

• D. Error

Which of the following is NOT a basic data type in R?

• A. Numeric

• B. Character

• 
  C. Matrix

• D. Logical

What will be the output of the following?

class(3.14)

• A. "double"
  
  
  

• B. "numeric"

• C. "integer"

• D. "float"