DA0-002 Data Acquisition and Preparation Practice Question
An analyst needs to identify outliers in a numeric column 'transaction_amount' using the interquartile range (IQR) method. Which TWO steps are part of this process? (Select TWO).
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
✓
Subtract 1.5 times the IQR from Q1 and add 1.5 times the IQR to Q3 to define bounds
The IQR method involves calculating Q1 and Q3 to find IQR, then defining lower and upper bounds as Q1 - 1.5*IQR and Q3 + 1.5*IQR. Computing mean and standard deviation is for Z-score method; calculating median alone is insufficient.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Subtract 1.5 times the IQR from Q1 and add 1.5 times the IQR to Q3 to define bounds
Why this is correct
These bounds are used to flag outliers.
- ✗
Calculate the median of the column
Why it's wrong here
Median is not directly used in the IQR method for outlier detection.
- ✓
Calculate the first quartile (Q1) and third quartile (Q3)
Why this is correct
Q1 and Q3 are needed to compute IQR.
- ✗
Sort the data and remove the top and bottom 5%
Why it's wrong here
This is a different trimming approach, not IQR.
- ✗
Compute the mean and standard deviation of the column
Why it's wrong here
These are used in Z-score method, not IQR.
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