Representation Intermediate Quiz 3
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Quiz 3
1. In R, what does the function str_detect() from the stringr package do?
Splits a string into multiple columns
Replaces all spaces in a string with underscores
Returns TRUE if a pattern is found in a string, FALSE otherwise
2. In spreadsheets, what does the VLOOKUP function do?
Looks for a value horizontally across a row
Searches for a value vertically in a table and returns a corresponding value from another column
Combines multiple tables into one
3. In R, what is the purpose of the dplyr function mutate()?
Creates new columns or modifies existing columns in a data frame
Selects rows based on a condition
Deletes columns from a data frame
4. In spreadsheets, what does the ROUND function do?
Converts numbers to text
Counts numeric cells in a range
Rounds a number to a specified number of digits
5. In R, what does the tidyr function pivot_longer() do?
Converts a matrix into a data frame
Converts wide-format data into long-format data by gathering columns
Merges two data frames by a key column
6. In spreadsheets, what does the PROPER function do?
Capitalizes the first letter of each word in a text string
Converts text to all lowercase letters
Removes extra spaces from text
7. In R, what is the difference between inner_join() and full_join() in dplyr?
inner_join() keeps all rows; full_join() keeps only matching rows
Both functions behave the same way
inner_join() keeps only rows with matching keys; full_join() keeps all rows from both tables
8. In spreadsheets, what is the difference between a clustered column chart and a stacked column chart?
Clustered shows trends; stacked shows percentages
Clustered displays separate columns side by side; stacked stacks values on top of each other
They are identical in layout
9. In R, what does the function na.omit() do?
Converts NA values to zeros
Converts NA values to empty strings
Removes rows containing NA values
10. In spreadsheets, what is the purpose of conditional formatting?
Highlights cells based on specified rules or conditions
Automatically removes duplicates
Converts numbers to percentages
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