R Programming Language Certification Data Visualization & Reporting 2

Question 1

Which ggplot2 function modifies the overall appearance of a plot (background, gridlines, fonts)?

Accepted Answer

theme()

Answer

scale_color_manual()

Answer

labs()

Answer

coord_flip()

Question 2

What does coord_flip() do in ggplot2?

Accepted Answer

Swaps the x and y axes

Answer

Reverses the color scale

Answer

Flips the plot to polar coordinates

Answer

Inverts the y-axis direction

Question 3

Which R Markdown output format produces an HTML document?

Accepted Answer

html_document

Answer

pdf_document

Answer

word_document

Answer

beamer_presentation

Question 4

Which function adds axis labels and a title to a ggplot2 plot?

Accepted Answer

labs()

Answer

title()

Answer

axis_labels()

Answer

annotate()

Question 5

Which ggplot2 geom creates a box plot?

Accepted Answer

geom_boxplot()

Answer

geom_box()

Answer

geom_whisker()

Answer

geom_quartile()

Question 6

In the Shiny framework in R, which function creates a user interface layout with a sidebar and main panel?

Accepted Answer

sidebarLayout()

Answer

fluidPage()

Answer

bootstrapPage()

Answer

navbarPage()