DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is using the IQR method to identify outliers in a dataset. The first quartile (Q1) is 25 and the third quartile (Q3) is 45. What is the upper bound for identifying outliers?
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
✓
75
Upper bound = Q3 + 1.5 * IQR; IQR = Q3 - Q1 = 20; 1.5*20 = 30; 45+30 = 75.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
85
Why it's wrong here
Incorrect calculation.
- ✗
65
Why it's wrong here
Incorrect calculation.
- ✓
75
Why this is correct
Correct: Q3 + 1.5*(Q3-Q1).
- ✗
55
Why it's wrong here
Incorrect calculation.
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