Data Science using R Quiz

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

• import.csv()

• read.csv()

• read.file()

• load.csv()

What does the getwd() function do in R?

• Gets the current working directory

• Changes the working directory

• Prints the working directory

• Sets the working directory

Which package is required to read Excel files in R?

• xlsx

• readxl

• excelR

• openxlsx

What is the default value of the header parameter in read.csv()?

• 1

• TRUE

• FALSE

• NULL

Which function is used to write data to a CSV file in R?

• write.csv()

• export.csv()

• create.csv()

• save.csv()

What does JSON stand for?

• Java Object Notation

• JavaScript Open Notation

• JavaScript Object Notation

• Java Standard Object Notation

Which function is used to merge two data frames in R?

• join()

• merge()

• combine()

• concat()

What is the purpose of the write.table() function?

• To create a new data frame

• To export data to a text file

• To modify a data frame

• To read data from a text file

Which function is used to calculate the average salary for each department?

• summary()

• tapply()

• mean()

• aggregate()

What is the correct way to set a new working directory in R?

• setwd('C:\new_directory')

• set_directory('C:\new_directory')

• directory.set('C:\new_directory')

• changewd('C:\new_directory')