1. 1. What is a census? 2. Why is it difficult to compare census information between countries? 3. Why can census information be unreliable? 4. How can population presented? Name as many ways as you can. http://www.indexmundi.com/g/g.aspx?v=21 &c=sp&l=en

2.  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 Ratio: the relation between dependents (old and young) and economically active. The dependency ratio is calculated using the following formula: N.B: The dependent Population is the sum of old and young dependents. Examples: 1.The UK has a dependency ratio of 0.65 (2004) 2.India has a dependency ratio of 0.54 (2012) 3.Greece has a dependency ratio of 0.37 (2004) Examples: 1.The UK has a dependency ratio of 0.65 (2004) 2.India has a dependency ratio of 0.54 (2012) 3.Greece has a dependency ratio of 0.37 (2004)

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

6. Homework 1.Work out the population dependency rate for Spain? 2.Does Spain have a high or low dependency ratio? Explain your answer using statistics 3.Create a population pyramid for The Gambia – depending on the year you were given