CompTIA Data+ (DA0-002)Data Concepts and EnvironmentsHard
A data analyst is examining a dataset of customer demographics. One column, 'MaritalStatus', contains values such as 'Single', 'Married', 'Divorced', and 'Widowed'. This column is used to group customers for marketing campaigns. What type of data does 'MaritalStatus' represent?
- ANominal
- BInterval
- COrdinal
- DRatio
Show answer & explanationAnswer & explanation
Correct answer: A. Nominal
Nominal data represents categories that have no intrinsic order or ranking. While 'MaritalStatus' categorizes individuals, there is no inherent order or hierarchy between 'Single', 'Married', 'Divorced', or 'Widowed'.
Why the other options are wrong
- B. Interval data has ordered values with meaningful and equal intervals, but no true zero point (e.g., temperature in Celsius). Not applicable here.
- C. Ordinal data has a meaningful order, but the intervals between values are not necessarily equal (e.g., 'Good', 'Better', 'Best'). 'MaritalStatus' has no order.
- D. Ratio data has all the properties of interval data, plus a true zero point, allowing for meaningful ratios (e.g., height, weight). Not applicable here.
Nominal Data
A level of measurement that classifies data into distinct categories where there is no particular order or ranking among the categories.
- Represents qualitative data (labels, names, types).
- Cannot be ordered or measured numerically.
- Examples include gender, country of origin, hair color, marital status.
Memory trick: Remember 'NOIR' for Nominal, Ordinal, Interval, Ratio – like a staircase of increasing data power.