OOP and Data Management Quiz

What is the purpose of I/O operations in R?

• To create graphics

• To manage objects in memory

• To read from and write data to external files or the console

• To perform linear regression

Which function is used to read a CSV file in R?

• import.csv()

• load.csv()

• read.csv()

• write.csv()

What does the 'na.strings' argument do in the read.csv function?

• Specifies the file path

• Defines how to handle missing values

• Determines the separator used in the file

• Sets the header of the file

Which package is commonly used for web scraping in R?

• ggplot2

• dplyr

• rvest

• tidyr

What is the equation for a simple linear regression model?

• y = mx + c

• y = mx + c + e

• y = ax^2 + bx + c

• y = m + c

What does the 'legend' function do in R graphics?

• Changes the color of the plot

• Saves the graph to a file

• Creates a descriptive legend for the plot

• Adds a title to the graph

Which function allows you to add custom labels to a graph?

• label()

• annotate()

• text()

• addText()

What is the purpose of the 'locator' function in R?

• To save a plot to a file

• To select points on a graph by clicking

• To create a new plot

• To adjust the axes of a graph

Which function is used to create a 3D surface plot in R?

• rgl()

• plot3D()

• wireframe()

• scatterplot3d()

What does the 'dev.off()' function do?

• Opens a new graphics device

• Closes the current graphics device

• Saves the current plot

• Lists all active devices