Paper 1 · Research Aptitude
In which scale of measurement do we have classification and order along with equal intervals between values, but no true zero point?
AOrdinal
BNominal
CInterval ✓ Correct
DRatio
Correct answer: (C) Interval — The scale with equal intervals but no true zero is the interval scale, so that is the answer.
Explanation
★The scale with equal intervals but no true zero is the interval scale, so that is the answer.
★The interval scale classifies, orders and has equal distances between successive values.
★But it has no true zero, so ratios of its values are not meaningful, as with temperature in Celsius.
★The nominal scale only names categories, with no order or equal intervals.
★The ordinal scale adds order but not equal intervals between the ranks.
★The ratio scale has a true zero, so the scale with equal intervals but no true zero is the interval scale.
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