Why ggplot2 creates publication-quality graphics in R Programming - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic ggplot2 scatter plot.

R Programming

library(ggplot2)
ggplot(data = mtcars, aes(x = wt, y = mpg)) + geom_[1]()

Drag options to blanks, or click blank then click option'

Apoint

Bpoints

Cscatter

Dgeom_point

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'scatter' instead of 'point' in the geom function.

Using 'geom_point' without parentheses.

Using 'geom_point' instead of 'point'.

The correct function to add points in ggplot2 is geom_point(). The code uses geom_point() to create a scatter plot.

2fill in blank

medium

Complete the code to add a title to the ggplot2 plot.

R Programming

ggplot(data = mtcars, aes(x = wt, y = mpg)) + geom_point() + ggtitle([1])

Drag options to blanks, or click blank then click option'

AMy Plot

B'My Plot'

C"My Plot"

DMy_Plot

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around the title string.

Using variable names without quotes.

Using single quotes inconsistently.

The title text must be a string, so it needs to be enclosed in quotes. Double quotes or single quotes work, but here double quotes are used.

3fill in blank

hard

Fix the error in the code to correctly map color to the 'cyl' variable.

R Programming

ggplot(mtcars, aes(x = wt, y = mpg, color = [1])) + geom_point()

Drag options to blanks, or click blank then click option'

Acylinders

Bcyl

Cmpg

D"cyl"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent variable name.

Putting the variable name in quotes inside aes().

Using a different variable like 'mpg' instead of 'cyl'.

The variable name inside aes() should be the exact column name without quotes. Here, 'cyl' is the correct variable name.

4fill in blank

hard

Fill both blanks to create a plot with points sized by 'hp' and shaped by 'gear'.

R Programming

ggplot(mtcars, aes(x = wt, y = mpg, size = [1], shape = [2])) + geom_point()

Drag options to blanks, or click blank then click option'

Ahp

Bgear

Ccyl

Dmpg

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up size and shape variables.

Using variables not in the dataset.

Putting variable names in quotes inside aes().

To size points by horsepower, use 'hp'. To shape points by gear, use 'gear'. Both are column names in mtcars.

5fill in blank

hard

Fill all three blanks to create a plot with customized labels and theme.

R Programming

ggplot(mtcars, aes(x = [1], y = [2])) + geom_point() + labs(title = [3]) + theme_minimal()

Drag options to blanks, or click blank then click option'

Awt

Bmpg

C"Fuel Efficiency vs Weight"

Dhp

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping x and y variables.

Not quoting the title string.

Using variables not related to the plot.

The x-axis is 'wt' (weight), y-axis is 'mpg' (miles per gallon), and the title is a string describing the plot.