DA0-002 Data Acquisition and Preparation Practice Question
A dataset contains a 'salary' column. The analyst wants to identify outliers using the IQR method. If Q1 = 40,000 and Q3 = 70,000, what is the upper threshold for a non-outlier?
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
✓
115,000
Upper threshold = Q3 + 1.5 * IQR. IQR = 70,000 - 40,000 = 30,000. So upper = 70,000 + 45,000 = 115,000.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
130,000
Why it's wrong here
This uses 2*IQR instead of 1.5.
- ✗
85,000
Why it's wrong here
This is Q3 + IQR, not 1.5*IQR.
- ✓
115,000
Why this is correct
Correct calculation: 70,000 + 1.5*30,000 = 115,000.
- ✗
100,000
Why it's wrong here
This is Q3 + IQR, incorrect multiplier.
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