MLS-C01 Exploratory Data Analysis Practice Question
Network Topology
An ML engineer runs the AWS CLI command above to list files in a training data bucket. The engineer notices that the three CSV files have different sizes but the same number of columns. What is the MOST likely cause of the size variation?
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
✓
The files contain a different number of rows.
Different numbers of rows directly affect file size. Options A and B are incorrect: compression algorithms would cause size differences but the files are CSV and likely uncompressed; duplicate headers would cause schema inconsistency, but the question states same number of columns. Option D is incorrect because different column data types do not necessarily cause size variation; they could still have same number of rows.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The files are compressed with different algorithms.
Why it's wrong here
CLI shows uncompressed size; not indicated.
- ✗
Some files have duplicate headers.
Why it's wrong here
Headers are minor.
- ✓
The files contain a different number of rows.
Why this is correct
Row count directly affects file size.
- ✗
The files have different column data types.
Why it's wrong here
Column types don't affect size as much as row count.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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