CompTIA Data+ (DA0-002)Data Concepts and EnvironmentsEasy
A data analyst is working with a dataset that includes customer ages, income levels, and the number of purchases made in the last year. Which of these data types allows for meaningful calculations of ratios and has an absolute zero point?
- AInterval data
- BRatio data
- COrdinal data
- DNominal data
Show answer & explanationAnswer & explanation
Correct answer: B. Ratio data
Ratio data is the only data type among the options that possesses an absolute zero point, allowing for meaningful ratio comparisons and all arithmetic operations. Customer ages, income levels, and number of purchases all fit this description.
Why the other options are wrong
- A. Interval data has ordered values with equal intervals but no true zero point, preventing ratio comparisons.
- C. Ordinal data has a meaningful order but unequal intervals between values.
- D. Nominal data categorizes without order or numerical significance.
Ratio Data
A type of quantitative data that has a true zero point, meaning zero indicates the complete absence of the measured attribute. This allows for all arithmetic operations, including meaningful ratios.
- Has a true zero point.
- Allows for meaningful ratio comparisons (e.g., 'twice as much').
- Includes measurements like height, weight, age, income, sales figures.
- Supports all statistical analyses.
Memory trick: NOIR: Nominal, Ordinal, Interval, Ratio – like a dark night.