Box plots and violin plots in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic box plot of the variable 'mpg' from the 'mtcars' dataset.

R Programming

boxplot(mtcars$[1])

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

Ampg

Bcyl

Cgear

Dhp

Attempts:

3 left

💡 Hint

Common Mistakes

Using a categorical variable like 'cyl' instead of a numeric variable.

Forgetting to use the $ operator to access the variable.

The boxplot function requires the variable name to plot. Here, 'mpg' is the variable representing miles per gallon.

2fill in blank

medium

Complete the code to create a violin plot of 'mpg' grouped by 'cyl' using ggplot2.

R Programming

library(ggplot2)
ggplot(mtcars, aes(x = factor([1]), y = mpg)) + geom_violin()

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

Ahp

Bcarb

Ccyl

Dgear

Attempts:

3 left

💡 Hint

Common Mistakes

Using a numeric variable like 'gear' without converting to factor.

Not converting the grouping variable to a factor, causing continuous x-axis.

To group the violin plot by the number of cylinders, we use 'cyl' as the x-axis variable, converted to a factor for categorical grouping.

3fill in blank

hard

Fix the error in the code to add a box plot layer to a ggplot object 'p' that plots 'mpg' by 'cyl'.

R Programming

p + geom_boxplot(aes([1] = factor(cyl), y = mpg))

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

Ax

By

Cfill

Dcolor

Attempts:

3 left

💡 Hint

Common Mistakes

Using y instead of x for grouping.

Using fill or color inside aes() without specifying x or y.

The x aesthetic should be mapped to the grouping variable 'factor(cyl)' to create separate boxes for each cylinder group.

4fill in blank

hard

Fill both blanks to create a combined violin and box plot of 'mpg' grouped by 'cyl' with ggplot2.

R Programming

ggplot(mtcars, aes(x = factor([1]), y = mpg)) + geom_violin() + geom_[2]()

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

Acyl

Bboxplot

Dpoint

Attempts:

3 left

💡 Hint

Common Mistakes

Using geom_point() instead of geom_boxplot().

Not converting 'cyl' to a factor for grouping.

The x-axis groups by 'cyl' and the second layer adds a box plot with geom_boxplot().

5fill in blank

hard

Fill all three blanks to create a violin plot with customized fill color by 'cyl' and add box plot overlay.

R Programming

ggplot(mtcars, aes(x = factor([1]), y = mpg, fill = factor([2]))) + geom_violin() + geom_[3](width = 0.1)

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

Acyl

Cboxplot

Dpoint

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variables for x and fill causing inconsistent grouping.

Using geom_point() instead of geom_boxplot() for overlay.

Both x and fill aesthetics use 'cyl' as a factor to group and color the plot. The box plot is added with geom_boxplot() and a narrow width for overlay.