Programming R Quiz

Programming R Quiz

11th Grade

10 Qs

quiz-placeholder

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Programming R Quiz

Programming R Quiz

Assessment

Quiz

Special Education

11th Grade

Practice Problem

Medium

Created by

David Eng

Used 11+ times

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the function `install.packages()` do in R?

It updates installed packages to the latest version.

It installs new R packages from CRAN.

It lists all available packages in CRAN.

It removes specified packages from the system.

Answer explanation

The function 'install.packages()' in R installs new R packages from CRAN, making it the correct choice among the options provided.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which function is used to read a CSV file in R?

read.csv()

read_excel()

open.csv()

file.open()

Answer explanation

The correct function to read a CSV file in R is read.csv()

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you create a vector in R containing the numbers 1 through 5?

c(1:5)

vector(1, 5)

list(1-5)

sequence(1, 5)

Answer explanation

To create a vector in R containing the numbers 1 through 5, you use the syntax c(1:5), which generates a sequence from 1 to 5.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What symbol is used to assign a value to a variable in R?

=

:=

<-

==

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a way to generate a sequence of numbers from 1 to 10 in steps of 2 in R?

seq(1, 10, by=2)

sequence(1, 10, 2)

1:10+2

c(1, 3, 5, 7, 9)

Answer explanation

The correct way to generate a sequence of numbers from 1 to 10 in steps of 2 in R is by using the 'seq(1, 10, by=2)' function.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you check the structure of a data frame named `df` in R?

structure(df)

str(df)

typeof(df)

describe(df)

Answer explanation

The correct way to check the structure of a data frame in R is by using the 'str(df)' function, which provides a concise summary of the data frame's structure.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the output of the following code snippet? ```R x <- c(TRUE, FALSE, TRUE, FALSE) sum(x) ```

0

2

4

TRUE

Answer explanation

The sum of logical values in R treats TRUE as 1 and FALSE as 0. Therefore, sum(x) will result in 2.

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