DA0-002 Data Acquisition and Preparation Practice Question
During exploratory data analysis, you calculate the IQR for a numeric column and find that several data points fall below Q1 - 1.5*IQR. These points are likely:
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
✓
Outliers
The IQR method defines outliers as points below Q1 - 1.5*IQR or above Q3 + 1.5*IQR. Points below the lower fence are considered outliers. They are not necessarily errors, but potential outliers. They are not the median or mode.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Normal variations within the distribution
Why it's wrong here
They are outside the typical range, so not normal.
- ✗
The mode of the dataset
Why it's wrong here
Mode is the most frequent value, not low extremes.
- ✗
The median of the dataset
Why it's wrong here
Median is the middle value, not lower extreme.
- ✓
Outliers
Why this is correct
The IQR method identifies outliers.
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