SCI 1102 Quiz: Human Population Growth 2

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7 Feb 2017
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Unit 1: Human Population Growth
Module 2 Demography
Module Overview
Now that you are familiarized with the topic of human populations, we will
examine the study of their characteristics, demography, with a publication
from the Population Reference Bureau. As with the textbook readings, ensure
that you can accomplish the tasks set out in the learning objectives for this
publication.
Reading:
Population Reference Bureau’s Population Handbook, 5th Ed. Chapters 1
13Population Reference Bureau, 2004PDF Format, 73 pp, 463 kb
Module Learning Objectives
After completing the assigned content and activities, students should be able
to:
PRB Population Handbook
1. Define demography and list and describe the tools used by
demographers to study populations.
- Demography
o The scientific study of population
- Tools used by demographers
o Census
o Birth & death records
o Surveys
o Visa records
o Motor vehicle & school registrations
2. Define median age, sex ratio, age-dependency ratio, and population
pyramid, and calculate sex ratio and age dependency ratio.
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- Median age
o The age at which exactly half the population is older & half is
younger
- Sex Ratio
o Ratio of males to females
o Usually expressed as the number of males for every 100
females
- Age dependency ratio
o Ratio of persons in the dependent ages to those in the
“economically productive ages”
o Usually under age 15 & over age 64 to ages 15 through 64
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- Population pyramid
o Graphically displays a populations age & sex composition
o Horizontal bar = numbers or proportions of males & females
in each age group
3. Compare and contrast “young” and “old” populations, citing
examples of each in the modern world.
- Young populations
o Developing countries
40% or more is under the age 15
4% is age 65 or older
- Old populations
o Old “aging”
Less than 25% is under the age 15
More than 10% is 65 or older
- Populations who have a large number of elders are likely to have
more deaths & fewer births each year
- The age structure of the populations does not seriously affect the
comparison
- Standardize overall rates
o In developing countries, large proportions of young people
virtually guarantee that the population will continue to grow
during periods of declining fertility
- A young population will continue to grow for a few generations as
the large proportion of youth move into & through their childbearing
years
4. Identify population pyramids that indicate rapid growth, slow
growth, or zero growth/declining populations.
- Rapid growth
o A pyramid with a large percentage of people in the younger
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