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WorksheetsQuiz Clean Data and Organize Data
Total questions: 10
Worksheet time: 5mins
What is the main purpose of cleaning data before analysis?
To make it look nicer
To ensure accuracy, consistency, and reliability
To reduce file size
To save time typing
Which function in Excel can be used to remove extra spaces from text?
REMOVE()
CLEAN()
TRIM()
SPACE()
What is a NULL value in a dataset?
A value equal to zero
A missing or empty value
A special character
A duplicate entry
Why are special characters like “@” or “#” a problem in data analysis?
They slow down computers
They confuse visual charts
They can disrupt data processing and formulas
They look unprofessional
What Excel tool can be used to eliminate repeated rows of data?
Merge & Center
Data Validation
Remove Duplicates
Conditional Formatting
Which of the following is a common method for handling missing data?
Ignoring it completely
Replacing it with average (Mean), Median or most common values
Deleting the entire file
Changing it to zero without explanation
What is “data validation” in Excel used for?
To calculate averages
To create charts
To prevent invalid data entry
To highlight top values
What kind of inconsistency might you fix under “inconsistent formatting”?
Missing rows
Different column names
Mixed date or number formats
File extensions
Which formula in Excel counts how many blank cells exist in a range?
COUNTBLANK()
COUNT()
ISNULL()
ISBLANK()
Why is removing duplicates important in data analysis?
To save space
To make the spreadsheet easier to print
To avoid skewing analysis and metrics
To follow spreadsheet etiquette
