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Population. What ways can we look at population?. Cultural background Age Sex Geographic location Native status Diseases. Why study populations?. The reason we study various populations is so we can answer questions like these: Why are more schools closing than opening? - PowerPoint PPT Presentation
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Population
What ways can we look at population?
Cultural backgroundAgeSexGeographic locationNative
statusDiseases
Why study populations?
The reason we study various populations is so we can answer
questions like these:
Why are more schools closing than opening? Why will you likely
have to work more years than your parents before retiring? Why are
old rock-and-roll groups, such as the Rolling Stones, still so
popular?
The percentage of one of these two age groups is increasing.
Which one?
Our 2 Ways
We will look at population in 2 ways:
Age/Gender &Geographic
Population Pyramids
Age/Gender
Population Pyramids
A method that uses graphs to make statistical data easier to
understand
A graph that depicts population distribution by age and
sexFemales on the right
and males on the left
Both sides show the percentages of people in each age
group.
The Study of Populations
Putting the two sides together can allow you to easily compare a
countrys population for different years (or to compare different
countries).
How to arrange the graphs
Different Ages/RolesDemongraphers have identified three important
stages of our lives in which we have different rolesStage 1:
Children (up to age 14)Stage 2: Working Adults (ages 15-64)Stage 3:
Older Adults (age 65 and over)
This model assumes that children and older adults are not
working and must be supported by the working population
Dependency Load
the part of the population that needs to be supported. It is made
up of two components: the 014 age group and the 65+ age
group.
Dependency Load
The portion of the population that is not in the work force
What is the effect of a high dependency load? Great deal of
pressure on the society to provide education, housing, health care,
old-age homes and other needs
The Study of Populations
What has happened to the dependency load between 1956 and 2004?What
is the significance of this change?
The Study of Populations
Populations within countries change over time in a predictable
manner as they become more industrialized.This is called the
Demographic Transition Model as was created by Thomas
Malthus.
The Study of Populations
What is happening at each stage?Why is it happening?
The Study of Populations
A specific pattern of population growth has occurred in many
developed nations during the past 60 years.
1945
1965
1985
2005
2025
Births
Baby Boom
Generation X
Baby Echo
Generation Y
Making a Population Pyramid
Rules
Males on the left, females on the rightAge is grouped in cohorts
(sets of numbers) ex. 0-4, 5-9 and numbers do not overlapAge
increases towards the top (oldest at top)The scale for males must
be the same as the scale for femalesThe scale at the top of the
pyramid can show either population or percentageLabel all axes
(including units of measure)Include a title complete with date of
pyramid and locationUse different colour for males and
females
Lets make the pyramid
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