Bell Work: August
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24 ,
2011
*Census
What is the Census?
How often is it conducted?
Why is the census collected?
What are some potential problems with
conducting an accurate census?
Population Continued
Population Composition
Population Composition
• Population composition concerns itself
primarily with the ages and genders of a
population.
– It also looks into other demographic info about a
population such as marital status and education.
• Population composition matters when trying
to combat problems within a particular area.
– Areas with a very young population will have
different concerns than an area with an extremely
old population
Population Pyramids
• Age and sex are key
indicators of
population
composition.
• Geographers and
Demographers use
population pyramids
to represent these traits
visually.
Population pyramids
• Pyramids display percentages of each age
group in the total population.
– Usually split into 5 year age groups.
– Males on the Left and Females to the right.
• A population pyramid can instantly convey
the demographic situation in a country.
Population Pyramids –
Charts that show the percentages of each age group in the
total population, divided by gender.
For poorer countries, the chart is shaped like a pyramid.
Infant mortality rates (IMR) are high, life expectancy is
shorter.
In poorer countries, Infant Mortality Rates(IMR)
are usually high, which is reflected in the pyramid shape.
Infant mortality rate (IMR) is one of the measures of the
condition of a countries population. Infant mortality is
recorded as a baby’s death during the first year following
birth. Normally recorded per thousand Live births
Child Mortality
• Infants who survive their first year of life
still do not have a a long life expectancy in
poorer areas of the world.
• Child Mortality Rate (CMR) is recorded
deaths of children that die between the ages
of 1 and 5.
– In extreme cases some countries have one and
five children die between these years.
In poorer countries, Life Expectancy is usually
shorter, which is also reflected in the pyramid shape.
Life Expectancy is another indicator of a societies well-being.
At birth this is an average of the number of years someone
might expect to remain alive.
Affect of AIDS on
population pyramid
for South Africa.
Predicted population for
2035, without and with AIDS.
With AIDS, looks like a
population “chimney.”
AIDS is leaving large numbers of AIDS orphans.
AIDS is creating large numbers of
AIDS care-givers.
Drawing by a Pokot boy in Kenya, the drawing shows
him working in the fields and taking care of his family
cattle in order to assist his sick family members.
Population Pyramids –
Charts that show the percentages of each age group in the
total population, divided by gender.
For wealthier countries, the chart is shaped like a lopsided
vase. In many wealthier countries population is aging, Total
Fertility Rates (TFR) are declining.
Total Fertility Rate
• The average number
of children born to a
woman of
childbearing age.
– Generally between the
years of 15-49
• TRF- To keep a
population stable over
time a country needs a
TFR of 2.1
Age Structure of a Population
• The populations of many countries are
Bordeaux, France
aging.
- eg. Europe
- eg. Japan
Photo credit: H.J. de Blij
TODAY!!!
• Today we are going to construct a
population pyramid of our beloved state of
Arizona!!!
• Your task is to analyze population data
from the U.S. census and create a
population pyramid for Arizona that could
be displayed for viewing.
• Finally Analyze your finished product.
– Describe the main features of its
population in the year shown.
– Identify the demographic characteristics
and processes of population change that
have resulted in the age and sex
composition of its population. (High Life
Expectancy, CBR, CDR, Males vs. Females,
rate of growth etc.)