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What does the mean() function in R do?

  • Calculates the median
  • Calculates the mode
  • Calculates the arithmetic mean
  • Calculates the standard deviation
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In R, what does the function str() do?

  • Sorts elements of a vector
  • Converts factors to characters
  • Displays the structure of an object
  • Searches for a substring in a character vector
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Which function is used to calculate the factorial in R?

  • fact()
  • factorial()
  • fact.calc()
  • calc.factorial()
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Which function is used to generate random numbers in R?

  • rand()
  • random()
  • runif()
  • rnorm()
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Which operator is used for element-wise multiplication in R?

  • *
  • **
  • %%
  • %%
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What does the unique() function do in R?

  • Removes duplicate elements from a vector
  • Sorts elements of a vector
  • Adds unique identifiers to elements of a vector
  • Creates a vector of unique elements
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What does the rep() function do in R?

  • Repeat elements of a vector
  • Replace elements of a vector
  • Reverse elements of a vector
  • Remove elements of a vector
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What does the rev() function do in R?

  • Reverses the order of elements in a vector
  • Removes duplicate elements from a vector
  • Reshapes a vector
  • Computes the reciprocal of elements in a vector
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Which function is used to sort a vector in R?

  • order()
  • sort()
  • arrange()
  • sort.vector()
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In R, what does the paste() function do?

  • Concatenates vectors
  • Splits a string into substrings
  • Replaces elements in a vector
  • Sorts elements in a vector
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Which function is used to calculate the exponential in R?

  • exp()
  • exponential()
  • exp.calc()
  • calc.exp()
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Which function is used to calculate the absolute value in R?

  • abs()
  • absolute()
  • value.abs()
  • abs.value()
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Which operator is used for exponentiation in R?

  • ^
  • **
  • ^^
  • ^
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Which function is used to apply a function over the margins of an array or matrix in R?

  • apply()
  • apply.func()
  • func.apply()
  • apply.over()
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Which function is used to rename columns in a data frame in R?

  • rename()
  • names()
  • colnames()
  • setnames()
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What is the output of ceiling(3.2) in R?

  • 3
  • 4
  • 3.5
  • 4.5
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Which symbol is used to assign values to variables in R?

  • =
  • :=
  • ->
  • <-
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How can you convert a factor to a character vector in R?

  • as.character()
  • to.character()
  • char()
  • convert.character()
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What does the tolower() function do in R?

  • Converts strings to lowercase
  • Converts strings to uppercase
  • Converts strings to title case
  • Removes spaces from strings
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Which function is used to convert a matrix to a data frame in R?

  • as.data.frame()
  • to.data.frame()
  • convert.data.frame()
  • matrix.to.data.frame()
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Which package is used for creating plots and graphs in R?

  • plyr
  • ggplot2
  • reshape2
  • dplyr
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What is the output of floor(3.8) in R?

  • 3
  • 4
  • 3.5
  • 4.5
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What does the any() function do in R?

  • Checks if any element in a vector is true
  • Checks if all elements in a vector are true
  • Checks if any element in a vector is false
  • Checks if all elements in a vector are false
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What is the output of sqrt(16) in R?

  • 2
  • 4
  • 8
  • 16
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Which function is used to check if a value is finite in R?

  • isfinite()
  • finite()
  • fin()
  • is.finite()
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What does the acronym 'CRAN' stand for in the context of R programming?

  • Comprehensive R Archive Network
  • Central Repository for Advanced Numerics
  • Core R Application Network
  • Combined Repository of Advanced Numerical tools
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What does the nrow() function do in R?

  • Counts the number of columns in a data frame
  • Counts the number of rows in a data frame
  • Counts the number of elements in a vector
  • Counts the number of unique values in a vector
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What does the read.csv() function do in R?

  • Reads data from a CSV file
  • Creates a CSV file
  • Deletes a CSV file
  • Modifies a CSV file
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What does the grep() function do in R?

  • Finds the position of a substring in a string
  • Replaces occurrences of a substring in a string
  • Removes occurrences of a substring from a string
  • Converts a string to lowercase
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Which function is used to calculate the length of a vector in R?

  • len()
  • length()
  • vec.length()
  • vector.length()
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