R Programming Practice Test 2

1. Which of the following is invalid assignment?

 > x <- c(10.4, 5.6, 3.1, 6.4, 21.7)

 > assign("x", c(10.4, 5.6, 3.1, 6.4, 21.7))

 > c(10.4, 5.6, 3.1, 6.4, 21.7) -> x

None of the mentioned

2. Which of the following is not an object of R?

strings

names

calls

expressions

3. Point out the correct statement?

Matrices are vectors with a dimension attribute

Numerical vectors are generated by conditions

seq() function has four arguments

The elements of a logical vector cannot have the values TRUE, FALSE, and NA

4. Attributes of an object (if any) can be accessed using the ______ function.

objects()

obj()

attrib()

attributes()

5. ___________ provides optional labels with the columns and rows.

Dimnames

Demnesd

Disnames

Denmes

6. If you explicitly want an integer, you need to specify the _____ suffix.

7. R is mostly used in ______________

Probability

All of the mentioned

Problem solving

Statistics

8. R has how many atomic classes of objects?

9. R has many functions regarding ________________

Statistics, Probability, Distributions

Statistics, Biotechnology

Distributions, Physics

Probability, Microbiology

10. What will be the output of the following R function?

paste("Everybody", "is", “a” , "warrior")

“Everybody is a warrior”

Everybody", "is", “a” , "warrior

“Everybody", "is", “a” , "warrior”

Everybody is a warrior