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    • R Programming Quiz

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    Question 1

    How can you perform linear regression in R using the lm() function?

    • A

      mice.impute()

    • B

      impute.data()

    • C

      mice()

    • D

      mice::complete()

    Question 2

    In R, what is the purpose of the summary() function when applied to a linear regression model created with lm()?

    • A

      Displays a summary of the model's coefficients

    • B

      Displays a summary of the model's residuals

    • C

      Provides a summary of the model's performance metrics

    • D

      Presents an overview of the model's input features

    Question 3

    In R, what is the purpose of the `purrr` package's `map()` function?**

    • A

      Applies a function to each element of a vector and returns a list  

    • B

      Applies a function to each row of a data frame and returns a vector  

    • C

      Applies a function to each element of a list and returns a list of results  

    • D

      Applies a function to each column of a matrix and returns a matrix

    Question 4

    What is the purpose of the `reshape2` package's `melt()` function in R?**

    • A

      Melts a data frame from wide to long format

    • B

      Casts a data frame from long to wide format

    • C

      Reshapes a data frame by merging columns  

    • D

      Applies a function to each element of a matrix

    Question 5

    What does the following R code do?

    df <- data.frame(name = c("Alice", "Bob", "Charlie"),
                    age = c(25, 30, 22))
     

    • A

      Creates a matrix with two columns: "name" and "age"

    • B

      Creates a data frame with two columns: "name" and "age"

    • C

      Creates a list with two elements: "name" and "age"

    • D

      Raises an error due to incorrect syntax

    Question 6

    What does the following R code do?

    x <- c(1, 2, 3, 4, 5)
    y <- sum(x)
     

    • A

      Creates a vector x with values 1 to 5

    • B

      Calculates the mean of vector x

    • C

      Calculates the sum of vector x

    • D

      Raises each element of vector x to the power of 2

    Question 7

    What is the purpose of the strsplit() function in R?

    • A

      Splits a string into substrings based on a specified delimiter

    • B

      Concatenates strings into a single string

    • C

      Reverses the order of characters in a string

    • D

      Extracts a substring from a string

    Question 8

    In R, what does the dendrogram class represent in hierarchical clustering?

    • A

      A scatter plot of data points

    • B

      A matrix of distances between data points

    • C

      A tree-like structure representing the clustering hierarchy

    • D

      A network graph of relationships between variables

    Question 9

    In R, what does the mutate() function from the dplyr package do?

    • A

      Adds new variables or modifies existing ones in a data frame

    • B

      Performs matrix multiplication

    • C

      Mutates the entire data frame

    • D

      Deletes variables from a data frame

    Question 10

    In R, what does the lapply() function do?

    • A

      Applies a function to each element of a list and returns a list of the results

    • B

      Applies a function to each element of a vector and returns a vector

    • C

      Applies a function to each column of a data frame and returns a list of the results

    • D

      Applies a function to each row of a matrix and returns a list of the results

    There are 25 questions to complete.

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