Representation Advanced Quiz 2
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Quiz 2
1. In R, what does the function pivot_longer() from tidyr accomplish?
Converts wide-format data into summary statistics
Converts wide-format data into long-format by collapsing multiple columns into key-value pairs
Filters rows based on multiple conditions
2. In spreadsheets, what is the main benefit of using structured references in Excel tables?
Automatically formats numbers as currency
Prevents cells from being deleted
Makes formulas easier to read and automatically adjusts ranges as the table grows or shrinks
3. In R, what does the function spread() (legacy tidyr) do?
Converts long-format data into wide-format
Collapses multiple columns into a list-column
Aggregates data by groups
4. In spreadsheets, how does the FILTER function work?
Returns the first match only
Returns an array of values that meet a specified condition
Removes duplicates from a range
5. In R, what does the function flatten() from purrr do?
Merges multiple data frames into one
Converts a data frame to a list
Flattens nested lists into a single-level list
6. In spreadsheets, what is the main advantage of using dynamic named ranges?
Automatically adjusts the range as data is added or removed
Prevents formula errors by freezing the range
Sorts the data automatically
7. In R, how does the function modify_if() from dplyr work?
Applies a function to all columns unconditionally
Applies a function to columns that meet a specific condition
Filters rows based on a condition
8. In spreadsheets, what is the primary use of the SEQUENCE function?
Creates random numbers
Filters data based on conditions
Generates an array of sequential numbers in rows and/or columns
9. In R, what does the function type_convert() from readr do?
Automatically converts columns in a data frame from character to the appropriate type
Converts all factors to characters
Converts all numeric columns to character
10. In spreadsheets, what is the purpose of using the LAMBDA function?
Automatically creates charts
Defines custom reusable functions without VBA
Filters dynamic arrays
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