Data Analytics Quiz 2

Data Analytics Quiz 2

Professional Development

20 Qs

quiz-placeholder

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Data Analytics Quiz 2

Data Analytics Quiz 2

Assessment

Quiz

Computers

Professional Development

Practice Problem

Hard

Created by

Shom Das

Used 2+ times

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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

function()

funct()

functions()

All of the mentioned

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

R functionality is divided into a number of ________

Packages

Functions

Domains

All of the mentioned

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following truncates real x to integers ?

as.numeric(x)

as.integer(x)

as.order(x)

All of the mentioned

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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’

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

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