Beginner R Quiz

1 / 10

What is the standard file extension for an R script?

.rscript

.R

.rs

.rprog

2 / 10

Which function installs a package from CRAN?

library("ggplot2")

install.packages("ggplot2")

require("ggplot2")

getPackage("ggplot2")

3 / 10

Which construct iterates over elements of a vector items in R?

for (i to items) { }

foreach (i in items) { }

for (i in items) { }

loop (i in items) { }

4 / 10

Which R object type stores a sequence of elements of the same atomic type?

data.frame

list

vector

matrix

5 / 10

How do you access the third element of a vector v?

v(3)

v[3]

v{3}

v$3

6 / 10

Which function shows the first few rows of a data frame df?

head(df)

start(df)

top(df)

glimpse(df)

7 / 10

How do you create a data frame from vectors x and y?

data.frame(x, y)

df(x = x, y = y)

as.dataframe(x, y)

make.data(x, y)

8 / 10

What does the function seq(1, 10, by = 2) produce?

A numeric vector: 1, 3, 5, 7, 9

A list of numbers from 1 to 10 inclusive

A logical vector of length 10

A character vector "1" to "10" by step 2

9 / 10

Which value represents a missing observation in R?

NA

NULL

NaN

"" (empty string)

10 / 10

What will the result of “1” + “1” be in R?

An error message

"11"

"2"

2

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