Which statement accurately describes an interval scale?

Which statement accurately describes an interval scale?

• A. It has a true zero point
• B. Intervals between adjacent values are equal, but there is no true zero point
• C. It measures qualitative categories
• D. It is based on rank ordering only

Answer: (B)

Interval scales are defined by equal distances between adjacent values, while lacking a true zero point. This means you can measure the size of differences accurately, but you cannot meaningfully say that one value is a multiple of another. Celsius temperature illustrates this: the gap from 20°C to 30°C is the same as from 10°C to 20°C, yet 0°C does not represent 'no temperature' in an absolute sense. If there were a true zero, the scale would be a ratio scale, where both differences and ratios are meaningful (like height or weight). The other descriptions refer to nominal or ordinal scales, which involve categories without inherent equality of intervals or true ranking.

Interval scales are defined by equal distances between adjacent values, while lacking a true zero point. This means you can measure the size of differences accurately, but you cannot meaningfully say that one value is a multiple of another. Celsius temperature illustrates this: the gap from 20°C to 30°C is the same as from 10°C to 20°C, yet 0°C does not represent 'no temperature' in an absolute sense. If there were a true zero, the scale would be a ratio scale, where both differences and ratios are meaningful (like height or weight). The other descriptions refer to nominal or ordinal scales, which involve categories without inherent equality of intervals or true ranking.