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Population structure and control

Population structure and control. What is a census ? Why is it difficult to compare census information between countries ? Why can census information be unreliable ? How can population presented ? Name as many ways as you can. http://www.indexmundi.com/g/g.aspx?v=21&c=sp&l=en.

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Population structure and control

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  1. Populationstructure and control Whatis a census? Whyisitdifficultto compare censusinformationbetweencountries? Why can censusinformationbeunreliable? How can populationpresented? Name as manyways as you can. http://www.indexmundi.com/g/g.aspx?v=21&c=sp&l=en

  2. Dependency Ratios A country's population can be divided into three groups, old dependents, young dependents and economically active. Old dependents: Anyone over the age of 65. These people are normally retired. Young dependents: Anyone under the age of 16. These people are normally being cared for at home or are at school. Economically active: People between the ages of 16 and 65. These people are normally working and pay taxes.

  3. Dependency Ratios N.B: The dependent Population is the sum of old and young dependents. Examples: The UK has a dependency ratio of 0.65 (2004) India has a dependency ratio of 0.54 (2012) Greece has a dependency ratio of 0.37 (2004) Dependency Ratio:the relation between dependents (old and young) and economically active. The dependency ratio is calculated using the following formula:

  4. Factors influencing High Dependency Ratios: Increasing life expectancy- people are living longer, which means that more children are being born and are also living longer. Falling death rates- Less deaths due to advances in medical care mean that less elderly are dying of degenerative diseases and infant mortality rates are decreasing. Rising Birth rates- more children + live to a large age. Immigration of dependents- if young and elderly migrate into a country, the dependency ratio will rise. Emigration of economically active- If economically active leave the country, the dependency ratio will rise as the number of economically active decreases.

  5. Ageing dependency Ratios dependency ratio: population aged 65+ -15 x100 population aged 15-64 Ageing ratio: The proportion of people over the age of 65 compared the total population.

  6. Homework Work out the population dependency rate for Spain? Does Spain have a high or low dependency ratio? Explain your answer using statistics Create a population pyramid for The Gambia – depending on the year you were given

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