1. R Programming Basics

JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

based on session 1

1. What is log2() an example of?

A format specifier

A relational operator

A base R function

A numeric value

Clear selection

2. What do equal signs (ie. =) inside the brackets of a function call mean?

Attaining return values

Assignment operators

Argument specification

None of the above

Clear selection

3. If number==12.0, what are the values of class(number), typeof(number) and class("number") respectively?

"numeric", "integer", and "character"

"numeric", "integer", and "numeric"

"numeric", "double", and "character"

"numeric", "double", and "numeric"

Clear selection

4. What is the recommended assignment operator in R?

Clear selection

5. You type the command x <- 12, but typeof(12) returns the value "double" so you code x <- 12L instead. Why did you add the L in 12L?

You want to round the value of x to two digits.

You want to increase the readability of your code.

You intend to make x an explicit integer.

Kazeera told you to.

Clear selection

If my_age == 23, then what is the value of -(-my_age)?

-23

FALSE

TRUE

Clear selection

TRUE

FALSE

True

False

Clear selection

8. What does the NOT operator do (ie. !)?

Stops and returns the original value of a variable

Reverses the true/false outcome of the expression that immediately follows

Performs a logical conjunction on two expressions

Returns the boolean value TRUE if either or both operands is TRUE and returns FALSE otherwise

Clear selection

9. What is the value for FALSE | FALSE | FALSE | FALSE?

TRUE

FALSE

NULL (empty)

NA (missing)

Clear selection

10. What is the value for (TRUE | TRUE) & (FALSE & FALSE)?

TRUE

FALSE

NULL (empty)

NA (missing)

Clear selection

What does Ctrl+1 and Ctrl+2 do in RStudio? (Try it out!)

Finds and replaces text within source documents

Switches focus to source editor and console pane

Comments and uncomments entire selections of code

Execute the line of source code where the cursor resides and stops it

Clear selection

Submit

Clear form

This content is neither created nor endorsed by Google. - Terms of Service - Privacy Policy

Does this form look suspicious? Report

Forms