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CA Foundation · Quantitative Aptitude · Statistical Description of Data

Which statement about the interval scale of measurement is correct?

On an interval scale, differences between values are meaningful but the zero point is arbitrary, as with temperature in Celsius. Ratios therefore make no sense. A true zero belongs to the ratio scale, pure classification to the nominal scale, and order without equal gaps to the ordinal scale.

  1. AIt has a true zero, so ratios of values are meaningful
  2. BDifferences between values are meaningful, but the zero point is arbitraryCorrect
  3. CIt only classifies observations into categories without any order
  4. DIt orders observations but differences between values have no meaning

Explanation

An interval scale has equal, meaningful differences but zero is arbitrary, as with Celsius temperature, so ratios are not meaningful. A true zero describes a ratio scale, classification only describes nominal, and order without meaningful differences describes ordinal.

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