Which of the following scales of measurement contains an absolute zero?

The ratio scale possesses a true absolute zero indicating complete absence of the attribute.

Its absolute zero makes ratios such as twice as much meaningful.

The nominal scale only labels categories, with no order or zero.

The ordinal scale ranks values but has no equal intervals or true zero.

The interval scale has equal intervals but only an arbitrary zero.

Weight, length and income are typical ratio-scale variables.