Interval Scale

An interval scale allows us to perform certain arithmetical operations on the data collected from the respondents. Whereas the nominal scale allows us only to qualitatively distinguish groups by categorizing them into mutually exclusive and collectively exhaustive sets, and the ordinal scale to rank-order the preferences, the interval scale allows us to measure the distance between any two points on the scale. This helps us to compute the means and the standard deviations of the responses on the variable

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