R Programming Language Certification Data Visualization & Reporting 3

Question 1

Which package in R is used to create interactive, web-based visualizations using the Plotly library?

Accepted Answer

plotly

Answer

ggvis

Answer

highcharter

Answer

rbokeh

Question 2

What does the knitr::kable() function do in R?

Accepted Answer

Generates a formatted table for R Markdown output

Answer

Knits an R Markdown document to PDF

Answer

Creates a ggplot2 table chart

Answer

Exports a data frame to Excel

Question 3

Which ggplot2 function controls the color palette for a discrete variable?

Accepted Answer

scale_fill_manual()

Answer

theme_color()

Answer

geom_color()

Answer

palette_discrete()

Question 4

Which R function renders an R Markdown file to its output format?

Accepted Answer

rmarkdown::render()

Answer

knitr::knit()

Answer

markdown::compile()

Answer

pandoc::convert()

Question 5

In Shiny, which function is used to display a ggplot2 plot in the UI?

Accepted Answer

plotOutput()

Answer

renderPlot()

Answer

ggplotOutput()

Answer

displayPlot()

Question 6

What is the purpose of geom_smooth() in ggplot2?

Accepted Answer

Adds a trend line or regression curve to a scatter plot

Answer

Smooths the edges of geom_point markers

Answer

Applies anti-aliasing to the entire plot

Answer

Interpolates missing data points