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

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

3. Patterns of Population Pyramids

4. 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

5. 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

6. 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

7. 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.