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Which option gives necessary conditions for reliable comparison of density data?

Answer and explanation

Correct answer: Same unit same time reference and clear area boundary

Direct answer: Option A is correct. To compare population-density figures fairly, the measurements must refer to comparable things. Density is commonly calculated as population divided by area, so the unit must be the same, such as people per square kilometre. The time reference must also be clear because population changes. The boundary of the area must be identical or clearly defined; otherwise one figure may cover a city while another covers a whole district. Option A includes all three necessary conditions: same unit, same time reference, and clear area boundary. Option B is wrong because different units and unclear boundaries can make a comparison misleading. Option C is wrong because mixing old and new figures without dates confuses changes caused by time with real geographical differences. Option D is wrong because area is needed for a density calculation and cannot be hidden. Exam cue: before comparing data, check unit, date, and boundary.

Related tags

Density ComparisonData ReliabilityUnit Boundary

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