Which statement describes ratio measurement?

Which statement describes ratio measurement?

• A. It has a true zero point.
• B. It shows ordinal positions with equal intervals between scores.
• C. It uses categories of equal size.
• D. It ranks data but no true zero.

Answer: (A)

Ratio measurement is the level of measurement that includes a true zero point, which lets you compare magnitudes using meaningful ratios (you can say one value is twice another). That’s why the statement saying there is a true zero point is the best description. Examples include height in centimeters, weight in kilograms, time, and money, where zero means absence of the quantity and where 6 kg is twice 3 kg. The other descriptions fit different data levels: showing ordinal positions with equal intervals aligns with interval data, which has equal gaps between values but no true zero; using categories of equal size describes a categorical or grouped scale that doesn’t establish a true zero; ranking data without a true zero describes ordinal data, which conveys order but not equal intervals or a meaningful zero.

Ratio measurement is the level of measurement that includes a true zero point, which lets you compare magnitudes using meaningful ratios (you can say one value is twice another). That’s why the statement saying there is a true zero point is the best description. Examples include height in centimeters, weight in kilograms, time, and money, where zero means absence of the quantity and where 6 kg is twice 3 kg.

The other descriptions fit different data levels: showing ordinal positions with equal intervals aligns with interval data, which has equal gaps between values but no true zero; using categories of equal size describes a categorical or grouped scale that doesn’t establish a true zero; ranking data without a true zero describes ordinal data, which conveys order but not equal intervals or a meaningful zero.