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Which operator is used for element-wise multiplication in R?

  • *
  • **
  • %%
  • %%
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What is the output of mean(c(1, 2, NA, 4, 5), na.rm = TRUE) in R?

  • NA
  • 3
  • 3.33
  • 3.5
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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 check if a value is finite in R?

  • isfinite()
  • finite()
  • fin()
  • is.finite()
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Which function is used to generate a vector of evenly spaced numbers in R?

  • evenly()
  • linspace()
  • seq()
  • range()
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Which function is used to create a sequence of numbers in R?

  • sequence()
  • seq()
  • create()
  • range()
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Which function is used to calculate the median in R?

  • median()
  • med()
  • median.calc()
  • calc.median()
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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 R stand for in R programming?

  • Research
  • Regression
  • Rapid
  • Recursive
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Which function is used to calculate the cumulative product in R?

  • cumprod()
  • prod()
  • cumulate()
  • accumulate()
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Which function is used to sort a vector in R?

  • order()
  • sort()
  • arrange()
  • sort.vector()
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What is the output of ceiling(3.2) in R?

  • 3
  • 4
  • 3.5
  • 4.5
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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 is the output of class(TRUE) in R?

  • Logical
  • Character
  • Numeric
  • Complex
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Which symbol is used to assign values to variables in R?

  • =
  • :=
  • ->
  • <-
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What does the which.max() function do in R?

  • Finds the maximum value in a vector
  • Returns the index of the maximum value in a vector
  • Finds the minimum value in a vector
  • Returns the index of the minimum value in a vector
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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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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 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 is the output of tolower("Hello World") in R?

  • HELLO WORLD
  • hello world
  • Hello World
  • hELLO wORLD
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What does the sum() function do in R?

  • Calculates the sum of elements in a vector
  • Calculates the product of elements in a vector
  • Calculates the mean of elements in a vector
  • Calculates the median of elements in a vector
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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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Which function is used to calculate the correlation coefficient in R?

  • cor()
  • correlation()
  • cor.coefficient()
  • correlation.coefficient()
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What is the output of 5 %% 2 in R?

  • 2
  • 3
  • 1
  • 0
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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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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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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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Which package is used for creating plots and graphs in R?

  • plyr
  • ggplot2
  • reshape2
  • dplyr
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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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Which package is used for data manipulation in R?

  • plyr
  • ggplot2
  • dplyr
  • reshape2
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