Free R Programming Language: Computer Science 114 Questions and Answers

Question 1

Which one of the following creates a string in R correctly?

Accepted Answer

user <- c("Jane", "Emily", "Shauna")

Answer

user <- 'Dave"

Answer

user <- c(Dave, Paul, Jane)

Answer

user <- 'Shana

Question 2

Which of the following statements most accurately sums up R's operator?

Accepted Answer

Assignment

Answer

Vector

Answer

Subtraction

Answer

Factor

Question 3

The starting index for R vectors is.

Accepted Answer

1

Answer

0

Answer

-1

Answer

NULL

Question 4

Which of the following best justifies changing an R string (or vector of strings) from lowercase to uppercase?

Accepted Answer

It aids in data validation

Answer

Lowercase strings are harder to work with

Answer

R can't handle lower case letters

Answer

It is a bug in the core compiler

Question 5

What R classes exist for scalar data types?

Accepted Answer

numeric, character, integer, logical, complex

Answer

numeric, character, integer, boolean, complex

Answer

numeric, string, whole, logical, complex

Answer

numeric, string, integer, logical, complex

Question 6

To repeat over a functional matrix?

Accepted Answer

Nested for-loop

Answer

If-else statement

Answer

Conditional expression

Answer

For-loop

Question 7

The statements in the following program will be executed in the following order:
Line 1: print (''welcome'')
Line 2: printHello <- function() {
Line 3: print(''Hello'')
Line 4: }
Line 5: printHello()
Line 6: print(''done'')

Accepted Answer

1, 5, 2, 3, 4, 6

Answer

5, 6, 1, 2, 3, 4

Answer

1, 2, 3, 4, 5, 6

Answer

1, 2, 5, 6, 3, 4