Statistics Dictionary
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Interval Scale
The interval scale of measurement is a type of measurement scale that
is characterized by equal intervals between scale units.
A perfect example of an interval scale is the Fahrenheit scale to measure
temperature. The scale is made up of equal temperature units, so that the
difference between 40 and 50 degrees Fahrenheit is equal to the difference
between 50 and 60 degrees Fahrenheit.
With an interval scale, you know not only whether different values are bigger
or smaller, you also know how much bigger or smaller they are. For
example, suppose it is 60 degrees Fahrenheit on Monday and 70 degrees on
Tuesday. You know not only that it was hotter on Tuesday, you also know
that it was 10 degrees hotter.
