Discussion
Arrange the following types of data in the order of their complexity :
I. Interval
II. Ratio
III. Ordinal
IV. Nominal
Answer: C
Ordering the levels of measurement from least to most complex gives nominal, ordinal, interval and ratio, which is IV, III, I, II (option C). Nominal data only name categories, ordinal data add rank order, interval data add equal intervals without a true zero, and ratio data add a true zero so ratios are meaningful. Option A runs from ratio down to nominal, option B places interval before ratio and ordinal after both, and option D puts ratio before interval; none follows the actual hierarchy.
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