Data Analytics Quiz 2

Functions are defined using the _________ directive and are stored as R objects

• function()

• funct()

• functions()

• All of the mentioned

Give the command to check if the element 15 is present in vector x.

• 15 in (x)

• 15 %in% x

• in(15,x)

• None of the above

X is the vector c(5,9.2,3,8.51,NA), What is the output of mean(x)?

• Error

• NA

• Will return mean of all integers present

• None

R functionality is divided into a number of ________

• Packages

• Functions

• Domains

• All of the mentioned

Which of the following truncates real x to integers ?

• as.numeric(x)

• as.integer(x)

• as.order(x)

• All of the mentioned

Which of the following command will help us to rename the second column in a dataframe named “table” from alpha to beta?

• colnames(table)[2]=’beta’

• colnames(table)[which(colnames==’alpha’)]=’beta’

• Both A and B

• colnames(table)=’beta’

Which of the following command will help us remove the duplicate rows based on both the columns?

• df[!duplicated(df),]

• unique(df)

• distinct(df)

• both a and b

What is the output?

for (i in 1:10) {

if (i %in% c(1,3,5,7)) {

next

}

if (i > 8) {

break

}

print(i)

}

• 2 4 6 8

• 2 4 6 8 10

• 1 3 5 7

• None

What is the output of the code

x <- 1

repeat {

print(x)

x = x+1

if (x == 6){

break

}

}

• [1] 1

  [1] 2

  [1] 3

  [1] 4

  [1] 5

• 1 2 3 4 5

• 1 2 3 4 5 6

• Error

Which of the following determine the least-squares regression line ?

• hist()

• lm()

• barlm()

• all of the mentioned