DA0-002 Data Analysis Practice Question
Which data cleaning method involves replacing a missing value with the average of the available values in that column?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Mean imputation
Mean imputation replaces missing values with the column mean.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Mean imputation
Why this is correct
Mean imputation uses column average.
- ✗
Interpolation
Why it's wrong here
Interpolation estimates based on surrounding points.
- ✗
Listwise deletion
Why it's wrong here
Deletion removes entire rows.
- ✗
Forward-fill
Why it's wrong here
Forward-fill uses previous value.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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