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Why can comparing population change be misleading if the time period is not stated?

Answer and explanation

Correct answer: Because the amount of change depends on the length of the period

Direct answer: A is correct. Population change is measured over a particular interval, and the length of that interval is essential for interpreting the result. Suppose a town gains 10,000 people in one year. That is a much faster change than gaining 10,000 people over ten years. The total increase is the same, but the annual rate and the pressure on services can be very different. To compare two places fairly, first check their starting populations, the beginning and ending dates, and preferably the annual or percentage growth rate. B is wrong because starting population is useful context but cannot replace the time period. C is wrong because an equal total increase may occur over unequal periods and therefore may produce different annual rates. D is wrong because dates tell us the interval over which births, deaths, and migration acted. Memory cue: no time period, no fair comparison.

Related tags

Population ChangeTime PeriodAnnual Growth RateDemographyProcesses Of Population ChangePopulationGeographyClass 9 Mcq

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