R Programming Basics

1.		Which of the following functions is used to install packages in R Programming?

library()

install.packages()

require()

package.install()

2.		Which of the following functions is used to calculate the standard deviation of a vector in R Programming?

sd()

median()

var()

mean()

3.		Which of the following functions is used to calculate the correlation between two vectors in R Programming?

cor()

cov()

cor.test()

All of the above

4.		Which of the following functions is used to apply a function to each element of a vector in R Programming?

apply()

lapply()

sapply()

mapply()

5.		Which symbol is used to assign values to variables in R Programming?

=

==

<=

=>

6.		Which of the following functions is used to convert a factor variable to a character variable in R Programming?

as.factor()

as.character()

factor()

character()

7.		Which of the following is NOT a data type in R Programming?

Integer

Float

Double

Character

8.		Which of the following functions is used to create a density plot in R Programming?

density()

plot()

hist()

boxplot()

9.		Which of the following operators is used to concatenate two vectors in R Programming?

+

*

&

c()

10.		Which of the following functions is used to generate random numbers in R Programming?

sample()

runif()

rnorm()

All of the above