Interval scales of measurement (IQ tests, anxiety inventories, mental status exams) are products of man's invention how frequently?
a. Never
b. Sometimes
c. Frequently
d. Always
ANS: D
In interval level of measurement, distances between intervals of the scale are numerically equal. Such measurements also follow the previously mentioned rules: mutually exclusive categories, exhaustive categories, and rank ordering. Interval scales are assumed to be a continuum of values. Thus, the researcher can identify the magnitude of the attribute much more precisely. However, it is not possible to provide the absolute amount of the attribute because of the absence of a zero point that really means zero on the interval scale. Interval scales are commonly used for surveys, scales, and inventories.
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