Quiz

Recap what you’ve learned by answering these 8 questions.

Question 1

What is a .R file?

A a file that helps R to know where in the file system you are working and organise files associated with the project.
B a script file where you can write and save code.
C a file used to store raw data to read into R.
D a configuration file that controls RStudio’s user interface layout.

Answer

B

Question 2

What is a .Rproj file?

A a file that helps R to know where in the file system you are working and organise files associated with the project.
B a script file where you can write and save code.
C a file used to store raw data to read into R.
D a configuration file that controls RStudio’s user interface layout.

Answer

A

Question 3

Which of the below will install and library load the ggplot2 package?

A Run the code load.package("ggplot2").
B Tick the box by ggplot2 in the Packages tab
C In the Packages tab, click Install and type ggplot2. Then run the code library(gpglot2)
D Run ggplot code and the package is automatically installed and loaded

Answer

C

(Note that B will library load the package but this will only work if the package is already installed on the computer.)

Question 4

If your data file is not reading into R what things could you check?

A That you are using the correct function for the type of file, for example read.csv for csv files.
B The name of the file is spelled correctly.
C The file exists in the folder you are directing R to.
D All of the above.

Answer

D

Question 5

Why will this code on it’s own not work? ggplot(data = penguins, mapping = aes(x = body_mass_g, y = flipper_length_mm))

A It also needs a geom layer.
B The mapping = part needs to be removed.
C The function should be ggplot2 instead of ggplot.
D The code is missing a theme() function which is needed to display the plot.

Answer

A

Question 6

Which of these is NOT the name of a geom layer?

A geom_smooth
B geom_point
C geom_aes
D geom_violin

Answer

C

Note that aes is not a geom but stands for aesthetic and tells R what variables to use.

Question 7

Which of these would you use if you wanted to only work with the Gentoo penguin rows of data?

A group_by()
B mutate()
C select()
D filter()

Answer

D

Question 8

What is tidy data?

A Data that has been cleaned of all missing values.
B Data that has no duplicated rows.
C Data where each variables forms a column, each observation forms a row and each cell is a single measurement.
D Data that has been sorted alphabetically.

Answer

C

Source