Introduction to R for Data Science

What will be the output of the presented code?

• number_3 is not found

• 0

• 10

• number_3 creates an error

The option showing which files are in the current working directory is ............

• wdirect()

• rm()

• wd()

• dir()

What are the 4 panels of RStudio?

• Source panel - Console panel - Environment panel - Output panel

• R panel - Studio panel - Tidyverse panel - Output panel

• Remove panel - Directory panel -Verse panel - Input panel

• Keyboard panel - Studio panel -Tidy panel - Input panel

What will be the output of the presented code?

• 0,25

• 25

• 2500

• 250.000.000

How many dimensions does the vector c(1,2,3,4) have in R?

• 1

• 2

• 3

• 4

What statement is not true about the "c()" function in R?

• It concatenates different elements into a vector.

• It is used to create a vector or combine elements.

• While using it, elements should be separated by commas.

• It helps to do something repeatedly for each item in a list.

What does the "by" parameter in the "seq()" function determine?

• The length of the resulting vector

• The step size between vector entries

• The number of times to replicate elements

• The operation to perform on each element of the vector

What does the "rep()" function in R do?

• Performs vectorized operations on each element of the vector

• Calculates descriptive statistics from the vector

• Concatenates different elements into a vector

• Replicates elements of vectors and lists

What function is used to get the data type of a variable in R?

• class()

• type()

• typeof()

• datatype()

What is not considered as a character vector?

• vector <- c(1, "two", 3, "four", 5)

• vector <- c("a", c("b", "c"), "d")

• vector <- c("", "", "a", "")

• vector <- "hello"