DA0-002 Data Analysis Practice Question
A data analyst is examining the distribution of customer ages in a dataset. The ages are: 22, 25, 29, 30, 31, 34, 35, 37, 40, 42, 45, 50, 55, 60, 65. Which measure of central tendency would be least affected by an outlier if a value of 120 is incorrectly recorded as age 120?
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
✓
Median
The median is resistant to outliers because it is the middle value when data are sorted. The mean is sensitive to extreme values, and the mode may not change but is not a robust measure of central tendency. The range is a measure of spread, not central tendency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Mode
Why it's wrong here
The mode may still be a frequent value but is not a robust measure of central tendency.
- ✓
Median
Why this is correct
The median is not affected by outliers.
- ✗
Mean
Why it's wrong here
The mean is influenced by extreme values.
- ✗
Range
Why it's wrong here
Range is a measure of dispersion, not central tendency.
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