11. Build Data Analysis and Transformation Skills in R using DPLYR

by Coursera Project Network

DPLYR 2: Graded Quiz

Graded Quiz Answers :

1.Question 1

What does the DPLYR verb mutate do?

1 / 1 point

Creates new variables while preserving the old variables

Creates new variables while deleting the old variables

Summarises variables using either R functions or homemade functions

2.Question 2

The function mutate can be used on a data frame's ...

1 / 1 point

Both Columns and Rows

Columns Only

Rows Only

3.Question 3

Why would you use an If Else statement with the verb DPLYR?

1 / 1 point

It is less code and more elegant.

It runs faster than an If Else statement using base R.

It is the only way to pass an If Else statement in R.

4.Question 4

When would you use mutate_all?

1 / 1 point

When the function you want to write would require a complicated for loop

When you need to pass a function to the entire data frame at once.

When you are cleaning data

5.Question 5

What does the function Names do when a data frame is passed through to it?

1 / 1 point

Returns the name of the data frame

Returns the name of the rows.

Returns the name of the columns

6.Question 6

Can a user defined function be passed to the mutate function?

1 / 1 point

No

Yes.