MLS-C01 Exploratory Data Analysis Practice Question
A machine learning engineer is evaluating a dataset for building a fraud detection model. The dataset has 1 million transactions, but only 500 are fraudulent. The engineer wants to understand the distribution of fraudulent vs. non-fraudulent transactions over time. Which EDA visualization is most suitable?
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
✓
Line plot of daily fraud rate and non-fraud rate
A time series line plot with two lines (fraud vs. non-fraud) shows temporal patterns. Option A is wrong because bar chart of counts per day is less effective for two categories. Option B is wrong because scatter plot with 1 million points is overwhelming. Option C is wrong because box plot shows distribution per time period but not temporal trend.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Bar chart of transaction count per day with colors for fraud status
Why it's wrong here
Why A is wrong
- ✗
Scatter plot of transactions over time colored by fraud status
Why it's wrong here
Why B is wrong
- ✗
Box plot of transaction amount per month grouped by fraud status
Why it's wrong here
Why C is wrong
- ✓
Line plot of daily fraud rate and non-fraud rate
Why this is correct
Why D is correct
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