The difference between atomic vectors and lists in R is that atomic vectors can contain multiple data types, whereas lists can only contain a single data type.

Consider the following data frame in R, named mydf:

Executing the command 

in R would return an error.

What is the output of the following commands?

What is the output of the following command?

What is the output of the following command?

A data frame is a rectangular collection of values, usually organised so that variables appear in the columns and observations appear in rows.

Which of the following functions can be used to determine what the current working directory in an R session is?

Consider the following data frame in R, named mydf:

What would the result of the following command be?

The mtcars object in R is a data frame.