At the interval level of measurement, distances between data elements can be determined. Temperature is the most
common variable measured at the interval level. With temperature, the difference between 40 and 50 degrees is the
same as the difference between 50 and 60 degrees. However, interval level data have no true zero.
Consequently, multiplication is not allowed with interval level data. This means that you cannot say that 10 degrees
is twice as hot as 5 degrees. Because there is no true zero, a reference point does not exist. Zero degrees Fahrenheit or
Celsius are arbitrary numbers that do not relate to the amount of temperature present. In contrast, temperature
measured in Kelvin has a true zero4 (absolute zero), where