What is the scale that has meaningful intervals but no true zero point?

The scale that has meaningful intervals but no true zero point is the interval scale. This type of scale allows for the measurement of the difference between values, which means that the intervals between values are consistent and meaningful. For instance, in an interval scale, you can say that the difference between 20 degrees Celsius and 30 degrees Celsius is the same as the difference between 30 degrees Celsius and 40 degrees Celsius, indicating that the intervals are equal.

However, what distinguishes an interval scale is the lack of a true zero point. This means that while zero is a point on the scale, it does not represent the absence of the quantity being measured. A classic example is temperature measured in Celsius or Fahrenheit. Zero degrees does not mean there is no temperature; rather, it is just another point on the scale. This characteristic is fundamental in understanding how interval scales differ from ratio scales, which do have a true zero point that indicates the complete absence of the measured entity.

In contrast, ordinal scales involve ranked categories where the order is meaningful, but the intervals between categories aren't uniform or quantifiable. Nominal scales classify data into distinct categories without any ranking or ordering. The ratio scale, on the other hand, includes all the properties of an interval scale