R Programming MCQs with answers Page - 120

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Q. What does the next statement do in R?

  • (A) Jumps to the next iteration of the loop
  • (B) Ends the loop immediately
  • (C) Skips the next condition in an if-else statement
  • (D) Moves to the next element in a vector

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Q. In R, what is the purpose of the repeat loop?

  • (A) To repeat a block of code until a certain condition is met
  • (B) To repeat a block of code a specified number of times
  • (C) To repeat a block of code indefinitely
  • (D) To repeat a block of code based on a specific condition

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Q. What is the result of the expression 5 %% 2 in R?

  • (A) 1
  • (B) 2
  • (C) 2.5
  • (D) 0.5

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Q. In R, what is the role of the ifelse() function?

  • (A) To check a single condition and execute different code based on the result
  • (B) To iterate over elements of a vector and apply a condition
  • (C) To generate random numbers based on a condition
  • (D) To switch between different conditions and values

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Q. What does the 'pch' option to par() control?

  • (A) the size of the plotting symbol in a scatterplot
  • (B) the line width in the base graphics system
  • (C) the orientation of the axis labels on the plot
  • (D) the plotting symbol/character in the base graphics system

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Q. Which of the following is a principle of analytic graphics?

  • (A) Don't plot more than two variables at at time
  • (B) Make judicious use of color in your scatterplots
  • (C) Show box plots (univariate summaries)
  • (D) Show causality, mechanism, explanation

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Q. How do you select columns from a dplyr data frame where the column names start with the letter 'a'?

  • (A) select_cols(starts_with("a"))
  • (B) choose_columns(matches("a"))
  • (C) select(starts_with("a"))
  • (D) pick_cols(matches("a"))

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Q. How do you perform a group-wise summary operation using dplyr's group_by() and summarize() functions?

  • (A) group_by_summary()
  • (B) group_summary()
  • (C) summarize_group()
  • (D) summarize()

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Q. How do you join two data frames based on a common column using dplyr's left_join()?

  • (A) merge_left()
  • (B) left_merge()
  • (C) left_join()
  • (D) combine_left()

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Q. If Linear regression model perfectly first i.e., train error is zero, then . . . . . . . .

  • (A) Test error is also always zero
  • (B) Test error is non zero
  • (C) Couldn't comment on Test error
  • (D) Test error is equal to Train error

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