Representation Intermediate Quiz 4
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Quiz 4
1. In R, what does the function recode() from dplyr do?
Removes unwanted columns from a data frame
Changes the values of a factor or vector based on a mapping
Converts numeric values to characters
2. In spreadsheets, which function would you use to join text from multiple cells into one cell?
SPLIT
LEFT
CONCATENATE or TEXTJOIN
3. In R, what is the purpose of the function summarise() in dplyr?
Creates summary statistics for groups or an entire data frame
Deletes columns from a data frame
Converts factors to characters
4. In spreadsheets, what does the IFERROR function do?
Counts the number of errors in a range
Returns a specified value if a formula results in an error, otherwise returns the formula result
Hides error messages without changing the value
5. In R, which function from dplyr would you use to filter rows based on a condition?
mutate()
select()
filter()
6. In spreadsheets, what does the LEFT function do?
Returns the first N characters from the start of a text string
Returns the last N characters from a text string
Splits a text string into an array
7. In R, what does the function arrange() from dplyr do?
Removes duplicate rows from a data frame
Orders rows of a data frame by one or more columns
Summarizes data by groups
8. In spreadsheets, what does the TRIM function do?
Converts text to uppercase
Splits text into multiple columns
Removes extra spaces from text, leaving single spaces between words
9. In R, what does the function rename() from dplyr do?
Changes the names of one or more columns in a data frame
Deletes columns by name
Selects rows matching a condition
10. In spreadsheets, what is the purpose of the MATCH function when used with INDEX?
Counts the number of matches in a range
Provides the row or column number to retrieve a value dynamically with INDEX
Sorts a range automatically
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