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Which option gives necessary conditions for a reliable comparison of population-growth data?

Answer and explanation

Correct answer: The same time period, the same definition and a clearly stated base population

The direct answer is A. A comparison is reliable only when the figures are measured on a like-for-like basis. First, use the same time period; comparing five-year growth with ten-year growth can distort the result. Second, use the same definition: total growth, natural increase and growth including migration are not identical measures. Third, state the base population, because a percentage is calculated in relation to a starting number. Option A includes all three requirements. B uses unequal periods and an unknown base, so its comparison is weak. C gives a percentage without telling how long the change took. D is wrong because migration is a real component of population change, not automatically an error. Memory cue: compare the same clock, meaning and starting point.

Related tags

Data ReliabilityGrowth ComparisonPopulation StatisticsPopulation GrowthPopulationGeographyClass 9 Mcq

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