# How we observe and document population trends

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How we observe and document population trends
Population Pyramids How we observe and document population trends

Population Pyramids… … are illustrations divided into [male] and [female] columns that show the distribution of ascending age groups in a selected population

Patterns of Population Pyramids

Rapid Growth Pyramids Pyramids that are shaped like an inverted V can be explained by many different factors, including: Poverty A Lack of Birth Control A 3rd World Economy A Lack of Healthcare Low Standards of Living Low Cost of Living

Slow Growth Pyramids Pyramids that are shaped like a beehive can also be explained by many different factors, including: Relative Wealth Birth Control & Education A 1st World Economy Some/Good Healthcare Good Living Conditions Moderate Living Costs

Negative Growth Pyramids
Pyramids that are taper towards the bottom can be attributed to many different factors, including: Abundant Wealth Extensive Birth Control & Education A 1st World Economy Extensive Healthcare Excellent Living Conditions Expensive Cost of Living

Creating a Population Pyramid
Take your Age-Sex Data Table and observe the population of Country A: 6,420,792 Now look at the number of Males from the age of 0-4: 479,894 479,894 / 6,420,792 = .0747, or 7.5% You multiply the product by 100 to achieve a percentage, then round up to the nearest half. Now take your Age-Sex Graph and draw a vertical line between 7 and 8 (7.5%) in the bottom left bracket (Males 0-4). Color the area from this line to the centerline blue to represent the percentage of the population which are males from the ages of 0 to 4. When you duplicate this process for the other side, use a pink or red color to represent females from the ages of 0 to 4. Continue repeating steps 1 through 5 all the way to the 100+ bracket using the data from your Age-Sex Data Table.